302 went out in my 79 ford f100 and i have a 289 out of a 65 mustang. it has been rebuilt. so i thought id put it in till i had the money to rebuild my 302.

Every thing went fine till i started tighting it down on the automatic trans(c6 im guessing). after i got it all bolted down i could not turn the engine over with a bar. it turned over fine when it was int the mustang. was wondering if it may have a bit of a diff in the spaceing at the back of the 289 where it bots to the trany and it was pushing on the converter, jamming it?

Iguess what im asking is. will a 65 model 289 work in a 79 f100.
the mustang had a c4 trans and i think the f100 has a c6.


Thanks