370. It is actually slightly smaller than a 6.2 even though it is stated that it is a 6.2. 61.024 x 6.2 is about 378 cubic inches. The 6.2 in a Chevy is a 376.
Found here that the supercharger weighs 80 lbs, so given a 392 long block's weight you could get a really good weight estimate that way. Still diggin'...