The cam you use on a 12:1 CR motor might be different than what you would use on a 10:1 CR motor. I would think how you manage the blowdown of the exhaust on a 12:1 motor would be a different than on a 10:1 motor, and would be especially sensitive on an exhaust manifold motor.

Scott, what do the heads flow, weight of the car, and the DA at Martin (?), if you don't mind my asking?

Nice running car!

Thanks