[jrmunn]

Hello Frost66,

I see that none of the more experienced forum members have replied to your post about problems after installing a Holley carburetor, so I will relate my experience. I converted my 64 GMC 3/4 ton pu with a 305E v6 from the stock Stromberg two-barrel carburetor to a Holley 500 last year, without making any changes to the intake manifold. It ran great afterward without any changes in ignition system settings. But I had just replaced ignition parts because of another problem that turned out to be worn out points, with symptoms that included hard starting, backfiring, and engine dying at low speed. I recently found that the resistor wire is delivering a full 12 volts to the coil (this doesn't make sense, but I know that my voltmeter is working) that burns up points faster than expected. I had also replaced much of my fuel delivery system because of this.

Both power and general performance is better with the Holley. My only concern is that the truck seems to run rich.

I have purchased smaller jets for the Holley, a Pertronix ignition to replace the points, and a Pertronix coil that is supposed to give better long-term operation at 12 volts. These will be installed when time and weather permit.

Good luck with your truck.

JRMunn