360 with Nitrous?

I was thinking 50. But since im building up the engine regardless maybe its wise to spend the extra cash and time now instead of later down the road. Ive rebuilt stock engines. With stock parts. Never anything custom or slightly in that direction. Where is a good source or outlet to see what parts go best with what, and what to expect.

If you had a clean slate on this 360 what would you do. Mild and Cost Effective AKA CHEAP ...lol

The guys from Roadkill found a broken down 60's barracuda in a junk yard, installed a 750 double pumper and a nitrous kit, did a bunch of work to other parts of the car and sprayed its 360 to trap 110 mph a couple days later. I would think things like timing and spark plug gap and air/fuel mixture would be the things youd really want to focus on to help it live for a while with a mostly stock rebuild & small squeeze making a guesstimated 400 hp ya know?