It could be if it is a big block but a "long block" means it includes the heads a short block does not.
Because it is the last block to be filled.
1,8,4,3,6,5,7,2.
The 351M, is "modified." Windsor motor, with Cleveleand heads. So, I guessd a small block.
that is basically the heap paradox. lets say you have a million grains of sand. compared to 5 grains that is a heap. if you continuously take one grain away, when does that pile of one million become...