>The motor I'm planning to run is a stock late 80's TBI 454.<
I believe the 4L80e has been around since about '93. Get the 454, 4L80e, wiring and computor from the same truck. The price difference between a '93 and say an '89 is not going to be that great.
I hope you didn't expect to do this for pennies. You've got to deal with the extra weight, bigger brakes and steering $$$$$$$$$$$$ A couple of extra bucks for the drive train requirements you listed, is the least of your worries.
I agree to a point. He has the motor. I say go buy the Transmission, Computer, Throttle body off a 4L80 truck and use one of his motors. If you have a little negotiating skills you could probably walk away from that one with all the parts you need if you pull them yourself for cheap.
