I know someone selling a new (never used) DSS 351 shortblock. Its 8.5 to 1 has a saleen s251 supercgharged cam (Flat tappet) and I believe it was a 70 or 71 based block
He was looking to get $1,100 last I knew. Hes in Ronkonkama Long Island.
For 1100 its pretty much a steal