I talked to quite a few people about the same thing, and for that size of engine they recommend a 335 - 355 with a dynamic of about 7.5 - 8.0 for pump gas, thats why I asked you earlier what your dynamic was? you have a small cam but we don`t know all the specs. but it should still be close to the 8.0 . lots of different heads out there, that are really good, you just need to have someone sell you,on a set, that they are running. I`m sure you already have a manufacturer in mind. my opinion for what you have would be the 325- 335 with that size of cam