I don't know. Seems to me that the 69 Jet is small. I ran 76's and 84's in the rear on my 750 on my brown car. It was a Demon though. Maybe at light crusing it is ok and as you put your foot to it a bit you are tapping a hair on the secondary's and that is richening it up? Just a thought to toss around. I would almost put the bigger PV back in it and up the main Jet size a bit in to the 72-76 range and see how it acts.
I have a Holley 850DP for the stroker going in the scamp has 80's in the front and 90's in the rear with a 6.5 PV , the guy I bought it from was running it on his 408 Stroker and said it should be pretty close as it is for mine. We will see hopefully soon.
I will be tuning with a Wideband also and this stuff is all new to me using one.
