New motor start-up questions

[Seaark24v]

I'm a newbie to the tuning, downloaded the Tuner-pro, ordered the Moates APU, and I'm looking for some advise on which ECM program to use. The specs on the project are:

1991 V2500 suburban 4wd, formerly 350, still has 4l80e with transgo hd-2 kit, and 4.10 gears.

1990 462 CI. BBC, Vortec heads, 9.1:1 compression, 54mm TBI, 80lb matched inj., vacuum ref. AFPR, Edelbrock intake with EGR delete, Lunati cam, 495/515 lift, 250/256 advertised duration/ 112 LSA, full length hedman thermal coated headers, going into a 3" single.

My questions:

Should I use the ECM from the 1991 with 350/4l80 that is still in vehicle, or the ECM from the 454 truck with 454/th400?

What would be a good starting chip(?) for this combo to get the motor up and running for break-in/tuning?

If I use the ECM in the truck, will I need to repin the computer for the new motor?


I've been reading alot of the FAQ's on here and its still confusing to me.

Thanks for any help.

[EagleMark]

If you want the 4L80E trans to work you'd have to use the PCM that came with it in the truck. What is the PCM number? I'm guessing this one...
http://www.gearhead-efi.com/Fuel-Inj...Information-85

[Seaark24v]

Yep, that is the PCM.

[EagleMark]

This would be a good thread to understand what happened to that PCM.

http://www.gearhead-efi.com/Fuel-Inj...erceeded-to-D8