RE: four stroke assembly
Matt, does the 80 have the cam in front or in back?? If the cam is in front, you will find a small drill mark on the outside of the cam. With the piston at TDC, the mark on the cam points down. You can check with magnum service, they are great at answering questions. Other than the cam timing, the only other issue is adjusting the lifters. You want 0.002" tight, 0.003" loose and you have them set. Not much to it.
Don