74 C10 350 TH350. Stock (original) engine. Upgraded OEM points distributor to HEI. I removed coil, cap and wires. Turned harmonic balancer mark to 0. Checked where rotor was pointing before removing old dist. It was pointing to #6 plug. From info I have found, it should point to #1. Installed HEI and set rotor to point to #1 and would hardly run with dist turned all way counter clockwise. Is this a timing issue with cam and crank?