383 power upgrade help

If you are down on compression ratio you can angle mill your cylinder heads to get the most CC off of the big side of the chamber.

A set of 440 source Stealth heads flow better than most ported stock heads which makes them a good, inexpensive option. I would have a set shipped to Porter Racing Heads for prep and have him send you a cam when the heads come home. You don't need anything radical to make 450-500hp if you have headers and a decent intake. Even 425hp would be plenty for an all weather driver IMO. That is easily obtainable with the stock manifolds.