Quote:

The fuel filter is an inline type between the fuel pressure regulator and carb. It has 3/8 inch connections.




This does not seem right to me. You should minimize restrictions after the regulator. What side of the fuel filter are you measuring your fuel pressure? Does your filter see a lot of engine heat?

Do you have a picture of the under hood stuff, line, regulator, filter, and fuel pressure pick-up location?

I've run a Mallory 110 pump on mine (7.60s to 7.70s) and the pump could not keep up. I know others who run a 110 pump that are faster than me without any problems - the devil is in the details of the entire fuel delivery system and mine is fair at best. However, my problem was not intermittent or weather dependent.