I am putting a C-4 into a 91 mustang and have read the thousands of write ups on this and didn't find anything on these issues. First when I bolted the trans up I could not turn over the motor with a wrench I had to loosen up the trans a little bit to get the motor to turn. Is this normal or is somehting wrong? I used a c-4 from a 65 mustang with small bell housing so I got the 157 tooth flexplate the convertor also came out the same car so I fiqured the convertor was for the 157 flexplate so I don't think that is the problem?? But not sure. The other problem I had was that i used the block plate for the AOD and it is too big and the starter doesn't fit. I trimed the block plate to make the starter fit. The question is do I have to put a plate between the starter and the trans or can I just leave it bare? I can make a little plate if needed or can I put something else there??