Well, timing is right on, valves aren't sticking, replaced points & condensor, now going to replace plugs (look nasty from too much idling)and coil (mechanic friend says spark from coil wire should be blue when held against ground, kind of orange color spark now). All electrical and timing seems to be OK but still won't fire and pops back thru carb. I'll let you know what happens with new coil and plugs.