Motor Swap question

I have a 90 C1500 with the 5.7L 350 in it with TBI...200K miles. The main seal is blown, #1 cylinder is weak, and it is about time I replace the motor.

I found a 92 Buick Roadmaster with 92K miles... I know the engine is a 5.7L, but is it the same under all the computer junk that they used for the HVAC/ etc. or am I getting into a nightmare?

Any help would be appreciated.

call your local junkyard, they have a crossover manual and can tell if it will work.