Not sure what a LM7 is
But usually the cheapest way is to buy a wrecked donor vehicle usually a wrecked Tahoe or burb is cheaper than a pickup
And take what you need and sell off the rest
If you have space for it, you can get most of what you paid for the donor car back in parts and the engine is almost free
If you want an automatic I'd keep whatever Trans comes with the LS
We bought just the engine and harness for $550
Sent the computer to
"Team208 Motorsports "
http://www.team208motorsports.comIf o had it to do over again id send the harness too
The harness comes back with a fuse box and three or four wires to hook up
Everyone does it differently
We used the 87 tank and late model pump
Lot of people use a blazer or burb tank but then you lose the spare tire
And a NV-3500 five speed manual
We used late model Camaro exhaust manifolds
Dirty dingo engine mounts and you will also need some aftermarket mounts to move the AC compressor up top
On the LS motor the AC is montes on the bottom and it will hit the frame rail on your truck
We are getting ready to install the vintage air AC
I'd recommend using the auto Trans that comes behind the LS
If you try to get the computer from one truck and the harness from another and the transmission from another truck , you're just asking for trouble
A 2WD makes it easier since you don't have to adapt it to a transfer case and buy TWO new driveshafts
Sent from my iPhone using Tapatalk