Porting 302's

I have never ported heads before, and I ported a set of 302's for a 318 engine that I want to make 375 hp with. I have no access to a flow bench or a dyno, I will guess my hp by the et's it runs in the spring. I think for a 318, it looks like a good head to use for street/strip. I'll find out in a few months if those heads work with my amateur porting.