I would also be interested in the outcome of the A/F test at WOT using the drop base. Also need to know how much clearance between the under side of the cover and the top of the carb. No flow thru filter top, I'm assuming. I was running a spacer under the qjet and an RPM and had to run a drop base and go to a 2inch filter to fit under the hood. I don't think there was more than 1/2" clearance fo r air flow.