I have 72 Challenger 340 4spd with original std electronic distributor . It has FBO ecm box & coil. The engine has been rebuilt w hughes 220/224 hyd flat tappet and 9.5 cr. I broke in cam and found sweet spot for idle n timing. Idle 900 rpm and 16* btdc, 16 in-hg. I haven't got on road for full...