Sounds like a serious race head to me. Big runners, big static compression ratio. (over 12.0:1 with a flat-top piston). What would I do? I'd cc them to be certain of what I had before I would go any farther. Here's a cc burette kit that is affordable......
http://www.summitracing.com/parts/sum-911581/overview/

Pat, I think RHS has gone out of business. The last of their heads are being marketed by CompCams, who I think was the parent company of RHS.
Comp Cams 12403 Pro Torker Small Block Cylinder Head : Amazon.com : Automotive