Greetings & Happy Fourth of July Guys & Gals; This site (GBody Forum) has matured into the best site I visit, Period, Thank you moderators. Well I haven't made the road course yet. Carburetor problem still not fully resolved. But the good news is the Bronze Brick is back on the road as of yesterday. I borrowed a 750 HP main body, seems to work nearly as well as my 750 PV ProForm-QF that Holley still has! A few of weeks ago I got impatient waiting for the replacement to arrive, thinking that it may never arrive. And ordered a re-manufactured 750 HP direct from Holley just to prove that my ProForm unit was the problem. Disassembled it, mounted the main body to my QF base & metering blocks. WOW works good & NO Seepage. Called the Holley Tech guys (& they do a hell of a Good job) again & found out the replacement was on back order. Told them that the problem was defiantly my 750 PV ProForm main body & sent mine in, they still got it. In the mean time I re-assembled the Re-manufactured HP unit & have returned it. Then to my amazement a PF-QF 650 PV arrives, back order filled. Oh wrong CFM nearly useless, but still a good test inspection unit. So what do the two 750 HP's & the 650 PV have in common that my 750 PV doesn't. The 4-5 year mystery may be solved! And after many more hours of internet search & guessing wrong by PF- QF- Holley the first time I sent it to them. My 3 or 4 wrong guesses it appears that it's the finish on the metering block surfaces is at fault. TOO course & they may have done that the first time I sent it in? As the others all are very smooth & would explain why the red QF harder gaskets seemed to seep more that the Holley softer blue, but they seeped too, just not as much? When & if I get my PF-QF 750 PV main body back if the metering block surfaces aren't smoothed by them I'll be fixin' the finish myself. Another good thing out of this 4-5 year ordeal is I've advanced my knowledge of the Holley square bore carburetor, I know enough now to be dangerous! Anyway over the last 48 years ( since 1969) I've been fiddelin' with these & rebuilding them for friends & who ever asked, I just got one to do that is from a 19?? the first generation our beloved Holley's. The quiz today is what year Holley do I have in my shop? What car did this come off of? And yes it is valuable! Take care guys, Ole' Bob.