6a was dialed in pretty good when I ran it. AFR was in the low 13's, made 650 hp on my 470 back before the intake was ported, BSFC was 0.400, Correction Factor was 1.02 so pretty good air. Dyno shop is close to sea level.
My dyno sheets show that we had 88 and 99 jets in it for those pulls. That was the Mark W tune. Worked great from 3500 to 7000 rpm. If you're testing near sea level then I'd use the original Mark W. tune and let it rip.
Makes sense that as MOST dyno's do from 3500-7500 and up it may have been ok but trust me, it killed my oil n plugs below that and could NOT even do a burnout. I'm not bagging on anyone or pointing fingers but on the steet where it matters most, it was a pig and I know it was loaned out as well so who knows there. IIRC, it had .080-.090 but not 100% and not near my book..............I see zero reasons to EVER run a 4150 on any motor making good power and have proved it many times even on small-blocks that have picked up a several mph and .010's so me, I'd ditch/sell em all and put a real carb on that puppy...........
And .088-.099 jets........that's insane and even 1250's rarely run that size which should tell ya something...........
