Holley Accelerator Pump Questions?

Your primary jets at 67 sounds small, especially considering your altitude. I'd start with 74's and tune from there. If the throttle is open past 1/4 of the way, your'e really not pulling fuel from the transfer slot. The engine is trying to pull fuel from the boosters but velocity though the boosters is low when rpm is low. If you increase the size of the primary main jets, it will be eaisier for fuel to flow through to the boosters under low velocity conditions. Try it, it's cheap and it's always good to have some jets on hand anyway.

The accelerator pump isn't meant to be the sole provider of fuel during the off idle transition, but to ease the dip in fuel delivery between the idle transfer slot and boosters kicking in. Some applications with a tight convertor and low (numerically) rear gear and smaller displacement engine with a big carb may require the use of a Holley or Demon with annular boosters.

Your friend may well be right in regards to the power valve, but I'd swap the mains first and work from there. If you use your power valve to compensate for main jets that are too small, you will dump huge amounts of fuel in under part throttle conditions killing your mileage and washing down the cylinder walls as well as causing the "My Holley runs rich so it sucks" syndrome.

Hope this helps. :)

Edit: How much intial timing are you running?