Who has TBI?

[1972]

I have a 1989 C1500 with a 350 TBI motor and a 700R4 transmission. I want to put this combo in my 1972 C10. Is there anything tricky/difficult about it? The donor truck is complete and runs. There are a few things that I am thinking about:

I still have the gas tank behind my seat (in the 72) and I kinda' like it there, so what will I need to do for a fuel pump?

The 72 has factory air, can A/C lines/hoses be made or bought to connect to the factory A/C system? Both compressors are R-12, is there a 134-A conversion kit? Or could I use the kit and a 134-A compressor from a newer truck?

I think that the 72 still has the externally regulated alternator, is it difficult to re-wire the truck for the 89 alternator?

Is it difficult to make the 700R4 shift linkage connect?

I am not worried about exhaust or drivshaft modifications. If there is anything else that I should consider though, post up! Thanks.