I am looking for help to identify what has been said to be the following:

mid sixties small block, small journal, 4" bore, high nickle, 2 bolt main 302. The engine has a steel crank with factory numbers but has been no help in identifying the block.
I have some experience in small blocks after owning and rebuilding severl camero's and a Yenko Nova from 1970 but have not heard of this engine. I looked at the casting numbers and they gave no clue as to the stated Rarity of this block. Any help would be appreciated.