Martin Koiryohann

I'm a old mopar guy i use to have several trucks now i try to help other guys that have them im retired /disabled mopar guy my current " truck " isnt really a truck but it pulls like one . i'm currenty helping a young guy with doing a 1977 club cab truck it has a slant 6 he wants to put a big block mopar in it hes going to use it as a tow rig . can anyone here send me malformation on this swap? dose he have to cut & reweld the cross member?