Won't the 383 always weight more than the 360 if they both have the same advantages of aluminum parts? The 383 has wider bore centers, taller deck and skirted block. Just more cast iron.
Not saying it makes a huge difference, but it sure seems like the 383 will always weight more.
Yes but a stock sbm weight is considered acceptable handling wise, so if a modded big block weighs similar to that should be acceptable also, now if building something like an auto cross car then the benefit of even less weight can be an advantage.