5 liter MOPAR

+.120 291.7 cube 12.5/1 with a solid 300°/.500 lift 1.90/1.60 valves Single plane/750 carb.
514 hp. @7500 and 412 lb/ft @ 5000
Finding a block that could handle +.120 would be the key. Lots of core shift.
.120 overbore means paper thin cylinder walls, thick bores make more power, every time.