help deciding on a combo

[jesse79]

Hello i am new to this fourm and got a buch of questions
I did search and learned alot but i would like good honest advice and opions
Truck i will be putting this in is a 85 ccsb that is just getting started on
I posted all that in members rides
So i have a few options i can go with and thease parts i have on hand
I have a 5.7 vortec in a 96 chevy 4x4 no motor or case but the rest is there
A 90 chevy 4x4 tbi 5.7 with a fresh 700r
I also have 454 with a th400
I also have a 99 burban with a 5.7 vortec and 4l80
It works but would need a rebuild in the next yr or 2
I like power and i am not easy on stuff the truck might see some minor off roading and showing off lol
Mpg is kinda important i would like to be able to drive it as much as
possible i was gonna do a cummins swap but i csn buy alot of gas for 3-5k that would be the cost to do it
I will be selling what ever i dont use to fund this so if i gotta buy adapers or wireing stuff or tcase that is fine
Thanks for the help

[jesse79]

So far after alot of thinking this is so far the cheapest and easyiest combo
5.7 vortec 383 kit convert it to carb
Proubly do a custom cam from bullet or comp i have had good luck with them in the past
Good set of headers good tq converter
I would like to use a 700r its fresh and i gotta a tcase and adapter to make itbwork
But i just dont know if will hold up? Pushing 33's with 373 gears
Maybe my th400 will be ok on the rpms with my tire and gear choice
I can also go with 4.10s i got them also

[Irish_Alley]

if you keep your post to one on the same topic. more people will help out and not be repeating the same options as others

[jesse79]

Yea your right i was thinking the same i am just getting a lil to excited and i have a hard time makeing decisions
Sorry guys

[LeftysRodandCustom]

If gas mileage is even remotely a consideration then you can rule out the big block and the 4.10's 

[jesse79]

Mpg is a factor i think everyone wants to get the most out of what they got
I was thinking about this and i am stuck
Do i need overdrive and if i decide to run 35's
With 373 gears mabey the tourq of the big block is the way to go?
90% of my driveing will be 55mph and under and dont plan on pulling much of anything
My 454 only has 45k and the th400 shifts like new
With a good set of headers some differnt heads and a good cam
Maybe i could 10-12 mpg if i decide to run a 5.7 vortec with a 700r
Maybe i wont see much better mpg?

[LeftysRodandCustom]

When i built mine it was meant to be a street/strip toy so mileage was never a factor. With that said I run a 30" tall tire, 4.11 gears and a 1:1 high gear as would also be found in all TH350's and 400's. At 55mph I turn a solid 2900 RPM. I dont have any idea what it gets for mileage, heck i'd hate to even know. The taller 35" tires would help but not a lot. Overdrive would definitely help but then so would higher gears. I dont think 10-12 mpg is out of the question for any of those combos if geared right. 454s make a mountain of low end torque but if you pair them with low gears you can expect more like 7-8mpg

[jesse79]

Thanks for the reply
I thought i had my mind made up
5.7 vortec converted to carb with cam and headers
700R 3.73 gears and eather 33's or 35's
But the more i think about i just dont think the 700
Will last long and i dont do much driving over 60 mph
And it wont be a daily driver
Since i have a good running 454 and good th400
I am thinking some better heads smaller cc's get the comp
Up to a safe pump gas number do sine head work good intake carb and
Headers i think i would have a cheap and solid combo?