Stupid pre-buy questions

I'm looking at a '72 dart slant6 that I'm thinking of buying to get hands dirty. Per the seller and observation, there's three immediate problems that would need fixing:

1. Intake/Exhaust gasket leak 2. kickdown linkage bushing replacement 3. Carb Rebuild

When I swap out the gasket, do I have to take manifolds to machine shop for polishing/leveling or can I just eyeball it for warpage, pits, and other potential vacuum/leak sources?

Where the kickdown throttle attaches to tranny it weeps transmission fluid. Should I (can I) just find a replacement bushing? Should I replace the entire linkage? The Entire kickdown actuator thingy mounted on tranny?

Sorry for the ignorance. I only have basic knowledge and haven't picked up shop manuals yet for the detailed specifics where these could probably be answered. I'm trying to outline in my head what's required for least $ to bring a garage stored car back up to baseline.

Thanks for the help.