Hello,
I'm running a gen 6 502 8.75 compression air gap intake roller rockers and roller camshaft 228/ 238 @ 0.50 .601 lift on ex/ int and measuring exhaust temps are 1000 f to 1100 f degrees @ idle right at the head. I had a 750 vac sec and I bought a barry grant 850 but did tune... had to remove all the shavings out of after I tryed to fix the leak the base plate was still leaking fuel waiting for a new one to show up. I jetted the 750 to from 76 to 86 then to 90 jet size and the temp came down to 800 f I was just trying to run the 750 to get some time on the engine. any good ball park on jetting for the 850