73 up "spool mount" small block to big block conversion mounts $65

One time I bought a 73 road runner that someone had put a big block on a small block spool type K frame with the stock big block mounts. The motor was sitting about 1/2 inch forward of where it should. The fan was almost hitting the rad and the transmission mount had a 1/2 inch adapter plate to bolt in the tranny. The carb and kickdown linkage was modified and there was a 2 inch gap between the back of the motor and the firewall. It was a running and driving car however.

When we modify the SB spool k frame we move the ears back about 1/2 inch.

By that logic, these mounts should set the block back by about 1/2 inch. Bolting to the inside of the block ears, I could see how that would happen.