It's an 8007. I ass u me d that there was only one 390, but whad da I know.
Panic, you answered my next question - should mess with the PV or MJ 1st. I'll get some specifics from my carb guy about how to change them. I guess I'll try a 51 1st as Tom said (it's as good a starting point as any), then increments of 2 to see what happens. And of course keep watching the the vac gauge and mileage and recording the info (I've made so many changes lately from timing, different weights and different modified rotors, I need a new notebook)
My carb guy told me that he changes the jets, if needed, after every run with his drag car based on plug appearance - it must be relatively simple, even for me.
Tom,
Thinking while I'm typing, I probably should put in a lower PV, 3.5 for now, as you recommend and that way my data won't be affected by the PV opening. I can change it after I get the MJ set right.
Panic,
Regarding the plugs, 1,2 ,5 & 6 look perfect, but 3 & 4 are carboned minorly. The 1st time I found this I readjusted the valves (1st time since rebuild), but after another 800 miles they looked pretty similar.
