79 3/4 ton issues
 

I need some help/advice. ive got a 79' 3/4 GMC that im putting under a 51 chevy. i cant seem to get the cab to line up right with the frame. is it true that the front axles are offset to a side which might be throwing me off. And what would be a good mounting bracket for the front part of the cab is sits about 10 higher than the original mounting brackets.