I have a 312 standard bore and pistons, Mummert aluminum heads and his 270 cam. Sanderson headers, MSD ignition, currently running 3 94's on an Edelbrock 573 with a Fordomatic but have a new low riser Tbird 4bbl intake and Summit 4bbl ready also. Can I safely advance the cam timing to bring the torque lower in the RPM range? I installed the cam originally straight up using the standard index on the gears. Will this change flirt with piston/valve clearance?

57 Black Tbird 312/auto