Stock 1989 318 w/ 48k Miles - Rebuild Recommendations

I picked up a stock 1986 318 with 48k miles out of a New Yorker from a reputable salvage yard. It has perfect cylinder cross hatching on all cylinders when I looked through my endoscope. It has been sitting on a shelf for many years so I know I need to go through it and replace all the gaskets and seals. Trying to keep this as budget friendly as possible since I'm doing a frame up restoration and I know there will be more unforseen expenses coming up.

Parts I have collected for the engine:
- Eddy 1406 600cfm
- Eddy Performer Intake Manifold (newer style not the old LD---)
- 360 Cast Iron Intake Manifold
- 14" round air cleaner assembly
- felpro gasket kit
- I want longtubes but may have to wait. I do have a spare set of 2001 5.9L magnum exhaust manifolds with y-pipe. 98% sure it won't fit but I might give it a try for the heck of it.
- HEI distributor (unknown brand)

Additional Info:
- 302 heads with stock valves but will do some port work and gasket match. Not too much where it kills velocity.
- backface valves
- valve lap job with lapping compound
- replace valve seals
- seal holes by exhaust ports with 1/4-20 allen screws
- replace water pump, oil pump, double roller timing chain
- Carter electric fuel pump with new regulator and filter
- This is just a fun weekend cruise car for the family and I. It will get a cam one day but I may wait until my son is old enough to help and learn.

Questions:
1) What are your thoughts on reusing the stock cam and lifters? All parts will be carefully removed and labeled for each cylinder and which way is up.
2) Can I leave cam and main bearing in place when cleaning the block? Crank will be stored vertically. Engine will get all new freeze plugs with shellac once the cleaning is done, block is dried, and surfaces protected from rust.
3) Thoughts on reusing piston rings, cam bearings, and main bearings?
4) Do you think the valve springs, that have been compressed for many years, are still good.
5) Do you recommend tearing down an old motor to a bare block to clean it throughly before reassembly?

Any recommendations are appreciated.