Where can I find my motor info?

[JOKER]

I just bought this 87 Chevy 1 ton p/u. The problem I am having with this beast, is nothing is matching up. I have a steering pump bracket that only has 1 bolt holding it on and can not even tell anyone what year and size motor I have  .. So I can not find a replacement for it..
Also the fender emblem says deluxe custom 20, which I thought meant it was a 3/4 ton.  But I am having so much trouble matching up parts it is unreal..
I just temperarly replaced my brake pads (going to replace disc and rotors before putting on good pads.), they match up to 1/2 ton. abunch of other parts were matched up at 3/4 ton.. Is this normal?? Or did they old owners really mess this truck up??
Any advice would be great.
  Thanx. Joker.

[VileZambonie]

Post your vin # and do you have the spid label in the glove box?

[JOKER]

Well I got the vin# 1GCGR24KOHF375195, but there is no label on the glove box. Well there is no glove box. Some of the dash is missing.. LOL

[JOKER]

In fact where are all the numbers? Transmission do I need to pull it to find it? Motor ? ect? I see alot of forums with everyone knowing what they got. So I was wondering how I can find out mine. It would help me match up..
 

[zieg85]

1GC (US built) G (8001-9000 Hydraulic) R (1987-1991 2 wheel drive) 2 (3/4T) 4 (body type 2 door) K (350 V-8) O (check digit) H (1987) F (Flint MI built) the rest is the production #.

[JOKER]

    WOW. THANK YOU. SO IT IS A 3/4 TON. WHAT ABOUT THE MOTOR? HOW DO I FIND OUT ABOUT IT? THEY MIXED AN MATCHED THIS TRUCK, I THINK.

[JOKER]

What I mean about the motor is what year? and how do I make sure it is a 350? The reason I ask is I think in the past someone has done a motor swap.
Like for example the power steering bracket does not even match up with the motor.

[zieg85]

Under the alternator on the engine block is some numbers, post them.  If it is original to the truck with TBI on the back of the block is will have a 5.7 or 5.0 raised on the casting but are hard to see if still in the truck unless you have a small inspection mirror.

[JOKER]

ohh This could take awhile.LOL . I will have to post pics of what a mess this thing is in.. LOL. Let me see if I can clean it up alittle and get back at ya..
Thank you soo far for the advice..

[JOKER]

ok the only numbers I found was besides the firing order. was CFD207 That means it is a 305 right?