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ASSUMING your compression is fine, I would suspect one or more of the following: 1) Points gap slipped when you tightened the set screw (common problem) 2) Plug wires are not solid copper (i.e., you are using off-the-shelf automobile resistance wires) 3) bad condenser or coil (they occasionally are bad even new out of the box - dam# aftermarket parts) 4) Poor electrical connections - check EVERY wire for clean, bright, tigh connections 5) Worn distributor bushings (i.e., your distribuor shaft is floppin' around causing your points to open at diffring gaps). 6) rotor making poor connection to cap 7) Poor timing (you didn't mention whether you have a front or sde mount distributor) 8) Spark plugs are not "hot" range - use Autolite 437s r equivvalent 9) Poor aftermarket dist cap (mine fires on only 1/2 of the cap leads which means I have to perform a tune-up and scrape the carbon off my leads after about 10-15 hours run-time) 10) If above not helps, you may have a fuel starvation problem. Check the 3 fuel screens, carb adjustments, etc.
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