Slant six swap HELP!

This is out of a 65 a100 so I hope it is the same size.
You need to make sire the 170 is not the different size crank register. The later ones changed crank register size. I think the 170 was made through 69 so that could be an issue I think.

@Charrlie_S or @slantsixdan can tell us for sure.
Th