If you are not going crazy with anything, mostly street use, I would buy a pair of indy cast iron LA heads for around $499. Most are 915 castings with 2.02 intakes - new valves, guides, springs, seals, and valve job. Take them apart, do some pocket port work on them and port matching. If you are running a mild hydraulic cam, you can use most of your existing valve train over again ( and intake ). For the $, best bang for the buck out there IMO for a street small block. As mentioned, aluminum Eddy magnums would be a nice step up in performance from my suggestion, but more $. That's what's sitting in this project.