A hemi is a very complicated engine ---the time it takes to get oil everywhere is much more than other engines--if you have a oil primer, use it--if not and your car is a stick, tow or push it some distance to get oil pressure up.

With the blower and carbs make sure the timing is right on and the carbs are primed---if the cam is a flat tappet(not a roller) be prepared to keep it revved up to break in the cam lobes/lifters