Remove the side cover, use a real good screwdriver or impact wrench. The camshaft will stay in cover. Remove the camshaft from the side cover [you can use a couple of large screwdrivers to pry the camshaft & bearing from the cover]. Install camshaft back into motor one tooth advanced [turn camshaft gear counterclockwise one tooth]. Install cover. It should run better, but you may need to lower the main jet to a 74 or 76. if it still runs poor, you might want to check the lifter clearance, factory settings are .012", but a little closer on the intake lifter wouldn't hurt [.010"].
The long studs should be removed because they can warp the head or cause it to leak. There is a small bolt kit available to replace the studs.

That should help, let me know.........

Have fun,
Whizzer OuterBanks
Quenton