Anyone know this? 5.7 into a 81 truck

As far as the NAG goes, it can be done, you basically have to install sensors on either the wheels or driveshaft in order to get it to work. It is not for the faint of heart. What you'd really want to do is get a donor car in which you are able to get EVERYTHING. You'll want as much stuff as you can get, particularly the engine, transmission and body wiring harness. I'd also get the wiring harness, console and dash out of a donor car. Then get yourself a facotry service manual and begin tracing the circuits. Not impossible, and if you take your time and pay attention to detail you should be able to do it.

You're probably on your own for motor mounts for your truck, you might try either truck manifolds or Jeep manifolds for the exhaust, I doubt TTI would work, and it would be ridiculously expensive to find out. Hooker makes B-body headers they might work. You might also try Street and Performance, they make a set of headers for putting the Hemi into street rods.

Regards,

Joe Dokes