New member advice on rebuild

[Maladd]

Hi all, have lurked for a long time, but would love some advice. I currently have a 1968 c10 longbed stepside (which I love, so no interest in chopping it to a shortbed) with a tired 307 and 4 speed granny manual.
Truck is an A/C cab, but only has the box on the firewall and components in the cab. I know very little about A/C units, but I guess I'm missing drier, compresser and condenser.
My truck is also manual steering and brakes.
The body is in very good shape with no rust, but suspension and drivetrain could really use a re-build.

I want to get the A/C back in, rebuild the engine, and upgrade to power brakes and steering, and go to automatic transmission.

I have the opportunity to buy a 1969 long bed fleetside with a 350 with auto (he's unsure which trans), power steering, power brakes, and full A/C (OEM) for $1500.

My thinking is that I should buy the truck and tear it down to frame and rebuild the suspension, engine and trans and move my body over to the newly rebuilt chasis when I paint the body pieces from my truck.

I'm no mechanic by a long shot, but would this make sense to you guys? Seems like the best route for me to:

A. Continue driving my truck during rebuild
B. Get the upgrades I need at a reduced price

I guess I'm really looking for an affirmation that I have a good plan because my wife keeps looking at me like I've completely lost it when I talk to her about it.

Thanks in advance
Jeff