Not entirely sure of the plan yet. Put a deposit in this 8 years ago and kinda forgot what I wanted it for...We're Super Gas racing now so "all out" isn't as important as it was back then. We'll start with a 4.5 bore and 4.5 stroke and add some compression over the old Iron 800 HP motor hoping that the extra 100 inches and compression will get 900 HP with a single carb. The 572 inch will be a miss match for the air flow of the Stage 4 heads, so some Cam creativity will come in to play....should be interesting...F2 Pro charger may be in the future, not ready to take this on now. Dan,John, and Joe Hopkins