Questions on swapping standard to Automatic

[Truck96]

I have got a very nice 67 step side that's been previously restored.
It has a rebuilt inline 6, with a 3 speed on column and a aftermarket A/C on it not sure of the brand that the A/C is. I am wanting to put in a V-8 and a 700r4 transmission and keep the A/C unit. To make this go as simple and as quick as possible I would like to get all parts and stuff ahead of time. Anyone that has done this or has the knowledge to steer me in the right direction I would appreciate it. Starting with the steering column what years will fit and any alternative to not switching it out, and linkage to go with it, then the driveshaft since the yoke would be different what would be a good year to pick a drive shaft from, I no I would have to cut to length, and then for the aftermarket A/C the bracket is up top and high on the passengers side of engine, what would be the best way to get it hooked up to a v-8.

Thanks for any advice, I have dealt with engines a good bit way back but have not done any restoring or changing around, Only time I ever did tranny swaps was in the 80's and just installed floor shifters not what I want in this case, as I want it to be as close to stock as possible.