Vince, didn't mean to make my post questioning R&M's horsepower as being on the weak side sound like a put down -I still have drag racer's mentality sometimes. Like BED's w/ 900 HP running for 7 sec. and before the next run, fresh valve springs, etc., using a a ring package costing $1000.00.
In fact that 712 is over 40 HP more than the 412 drag race motors they advertise. Ya can't buy better quality.
Those would probably last 'til your grandkids are ready to Landspeed race, as I expect, will yours.
The close involvement I have with a CSt/R and knowledge of two faster -the ones with Ex-nascar motors, makes me think about 215 for your package in B.
DISCLAIMER -things are real fickle an the salt and lake bed and -I'm merely an INTERESTED BYSTANDER.