Replace engine now it does not idle or run right

Just installed a re-manufacture engine in my truck w100. I went from a 5.2 to a 5.9 -318 to 360. Timing is correct, cannot get it idle or run right. Starts fine fires right up. The 318 was thinking, I noticed that the 360 that year had a carburetor, I installed the think and intake back on the 360. Am I missing something?

I guess my question is would the TBI on that motor not be a good match. I did use a new 360 harmonic balancer, but running the 318 intake and TBI on the 360, it just will not idle. Is it possible that I should be using the 360 balancer and use the 318 that maybe the time is different?

Thanks, Mark