375-400hp 360?

Stock heads is going to take a bigger camshaft.

With a true 9.5 and decent bowl ported and cleaned up heads flowing 240ish, you can get 375hp with as small as a XE268 or Voodoo 268 camshaft. Larger camshaft, more HP

Heads will make or break the deal and require a smaller cam than with stock flowing heads.