I have a 1972 model 302 that came with auto c4 transmission. Swapping it back to 3 speed manual. I am at the point of taking off the flex plate and putting a flywheel on it. The bolt holes on the crank won't seem to line up. Does something have to be swapped here?? This is the first time I have ever messed with a transmission, so I don't really know too much about it. Any help or pointers would be appreciated.