I have 1969 C50 with a 350 in it.
was running poorly and backfiring through the carb on heavy acceleration. Idles reasonably well.
I replaced the distributor with a MSD HEI unit as the old points distributor looked work and needed new cap, rotor, points etc.
didn't change the backfiring through carb.
I removed one valve cover today and found that the rocker on the valve second from the firewall on the passenger side is not moving as far as the rest while running.
Bad Camshaft I guess?
