Well... I have been watching this thread and waiting to see what kind of numbers you got with your 512 combo as it is soooo close to mine. Here is the combo and numbers as it was on the Dynojet.

512 stroker,4.25 Source crank,H-Beam Rods,.030 over,17cc dish pistons,10.5 compression,OOTB Stealth heads,OOTB EDDY RPM intake,950 Proform carb,1 3/4 headers,Hughes Solid 579/587 Lift 256/260 Duration LSA 108,Crane Gold 1.5 Rockers,Hughes springs,retainers and locks.Smith brothers pushrods,Melling HV pump,7 qt.pan,stroker windage tray.

I used the 1 3/4 headers as they were all cheapy dinged up headers and I didnt want to ruin the ceramic coat on my Hooker 1 7/8 Super Comps

566HP / 5400RPM
640TQ / 3800RPM

Primary jets are 78 with secondary 86. We tried jetting it up but the numbers fell down. The best runs were at 36 and thats where we locked it in.

Fuel was a 50/50 mix of 87 pump and C14.