Yeah, I had one in my GMC.
Basically I used a harness from Painless. The wiring was easy once you read the direction carefully. (I had the power wire to the computer hooked up to a hot while in the run position....not the crank position
)
Other than that I used the stock fuel lines, spliced in a fuel pump that was mounted on the frame, and extended them using rubber hoses (efi rated) up to the stock TPI connection point.
I think that was about it as far as getting the engine to run.
Honestly, I wasn't impressed with my TPI 350. I had heard how much low end grunt these engines had. I don't know if mine never ran right or what (no obvious signs of problems) but I wasn't impressed. I think I ran something like 15.9 @ 86 mph at the track. I figured that that was about 240 RWHP, so it put down the power (considering what its factory rating at the crank was) but driving it, my carbed 327 was more fun. I did get something like 18mpg out of it with 3.73s and a 700r4.
Good luck!