Turbo slant 6?

The talk of intercoolers worries me a bit..... 8-10 psi boost is pretty safe but going beyond that starts taking more care. You can start at a lower level w/o an intercooler. This is not a CTD where 20-25 psi is normal stock pressures...And If was going to turbo it, I personally would not start with a reman'd engine.... quality control is going to be a key and you can't guarantee that through a reman. (But it also depends on your confidence in your skills too.)

Ima thinkin' that the rear axle needs a change too.

Fuel injection brings a whole host of new thing to solve so IMHO it is not necessarily a problem solver.

If you are going down this road, I'd suggest a rebuild with forged pistons and stockish CR, and start with a 2 BBL carbed system to get the engine running, cam broken in, and those issues wrung out. Then a trans and axle upgrade if you really are going turbo. Then start the conversion process. Biting it all off at once when you are new this game is a recipe for big trouble.