I'd go with the small Summitt cam and adv it 4 deg. The 1406 is real lean out of the box & MUST be richened on the cruise step. OT I would dial in the dist subsystems in order & some 68-70 HP iron ex manifolds and a mandrel ex system with free flowing (somewhat loud) muffs and in addition some glasspacks alonside the rear leafs to get the noise back to a respectable/tolerable level. The eddy RPM gets rave reviews as an excellent mild to wild intake if you have the hood clearance for it & it's a dual plane/square bore. Not sure if your stock intake is holding you back excessively or not. some gears would help. You need torque/cyl psi & definitely get into the dist curve