Again, this site is great. I'll try to address all the questions.
DennyW, do not know how to answer your question about tools/gauges. I am running a Mallory fuel pressure regulator set to 7 psi. I agree that the idle screws should not be bottomed in. There is no doubt that I have limited knowledge, but then don't we all?
Selmorides, I have a vaccuum gauge and will check power valve size soon. Great information on the vaccuum at idle in gear and the power valve. All of the aftermarket carbs I bought over the years have been for my Vette which is a manual transmission. I got away from vac. sec. carbs years ago when I experienced diaphram problems.
Big Truck Driver, I know that the 280H produces a lumpy idle I am not trying to tune it out, just make it more streetable. I'm using an aftermarket Sunpro tach wired directly to the distributor for my rpm readings.
Thanks for all this very helpful information. This gives me a great starting point. I'll gather some info and get back with you guys.
And Big Truck Driver don't worry I always have questions to ask.