I understand that the MP grinds are old tech but its proven technology that works. My dad is running what I think is the comp cam XE268, it is a .540 lift cam with 280 duration in his 67' Dart GTS that has a built 440.

Topside, were you talking about the 484 grind not having enough lift and too much duration and overlap?

Project War Bird: 1971 Plymouth Roadrunner 383 4 speed with air conditioning GY3 Curious yellow All original