Cole, I don't believe that the production Chrysler hemi heads will fit the B/RB series blocks, even though the Hemi was derived from that series. The link above is to an article for conversion Hemi-heads that were made specifically to fit the B/RB engine family. The company that made the heads was "Stage V". www.stagev.com
Here are the numbers on my block, let me know if you think they will work.
2536430 8 R/B
7A was stamped on the outside of the heads
N/D or N/O was above the block number. I do not know what that means.