[68RT]

1) What do the plugs look like now? Wet / Dry
2) Do you get a good spark?
3) How much slack in the timing chain. (Use socket on front pulley nut back and forth. Slack portion is easy to move until chain slack is taken up and it tries to move the camshaft) (degrees of slack)
4) How fresh is the gas going into the engine?

 

[68RT]

One old trick for hard to start engines with point sets was to take each plug wire and put it into the
coil and with the points open, short the points to ground several times (fire off the coil) until you get a reaction from that cylinder which could be anything from a backfire to slight movement of the cengine to a firing out the exhaust to make sure each cylinder was cleared out. Then put everything back in place and try it. Be sure you are clear of everything. Also, make sure that the coil primary wires are not switched. Makes a big difference.