Yes, VN type heads will fit, but are close to the a/con heater box. Some I have seen done, have fitted a heat shield (made of sheet aluminium with Dynamat or similar on it) to the heater box in the area where its close. B.T.W. I think that is why a lot of conversions have been done using later 5.7L engines, because there is more room on left bank

cheers
Max