Regarding the cubic inch selection,Number 1..
Get 632 cubic inches out of your head. Theres no need. Youre wasting perfectly good cylinder wall taking a new dart block to 4.600.
A 4.5 arm screws you. Rod angle sucks and it will beat the hell out of everything in the bottom end.
Back your cubic inches down to 540-572...preferably 540.
Put a 350ish cc head on it.
Edelbrock SV632 intake.
Pair of Borg warner S480 turbos.
Rick Prospero went 8oh's at 175+ on a stock block'd 468 with a pair of these.... in a 4200 pound car.. on leaf springs...
Theres no need to get stupid here. A twin 80mm'd 540 with the right pieces is a 7.90 capable combination every day of the week and twice on Sundays. Once before you drive the car to Church...once after.
How about if ur aiming for faster times ie. low 7 high 6s?
Same opinion? (ofcourse I'm talking about aftermarket blocks)