Trouble getting a slant six in the car

It’s actually a 77 225 I’m dropping into a 74, the motor that was in it previously was a 68 I think. Also a 225. But the problem I was having was even when I finally got the motor mounts in properly the block was still sitting on top of the bell housing cause it just wasn’t clearing
I’m still confused on what you referring to when you say that “the block was setting on top of the bell housing”. Are we dealing with a manual or automatic transmission?