Maybe bump the timing up and run a hotter plug. I had to run a 65K coil and NGK BPR5ES plugs with a .045 gap to get a really nice clean burn with my stock 292. Timing set a 10 initial. Pulled like a mad dog.


1966 C10 292/tko600 http://67-72chevytrucks.com/vboard/showthread.php?t=596643
1964 C20 292/sm420