Just a couple of quick questions. You never mentioned in either post what you are setting your timing at. The first step after installing any distributor is checking timing. Also since I'm short for time and don't know the Mallory numbers you posted, is your Mallory vacuum advance? Is the Mallory you're installing designed to run without an ignition box or computer? If it is a self-contained unit that requires no external box or computer it should work with an after-market Holley carb.