are you using vac. advance. if so, limit it to about 12-14 deg. if not, install one. it is absolute necessary on a street engine, and works in conjunction with the power valve you are about to install.. without a power valve, you are running a wide open throttle fuel mix at all throttle openings. sometimes it is helpful to think of the power valve as an economy valve. as the power valve closes, do to less throttle and therefore more vacuum, the vacuum advance unit starts pulling in more timing to compliment the now leaner mixture. a good way to guesstimate on a power valve value is to record engine vacuum @ 60MPH, assuming you have vacuum advance.
I'm closing out for bit . modem problems
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