mine seems to run pretty good with goos street manners, shooting for 11.5-7 next weekend. .030 over 440, h-beam rods, ross pistions (11.19:1), Ported Stage VI heads, comp cams 588 solid roller, stock 6-pack with 70 jets, 35 squitters, puprle springs, Fluidampr, headers, 3800 stall, TA man valve body and 3.91's. Car flat out blows the M&H's off thru 2 gears...I'm sure I'll have to do some track tuning but it idles at 1000 and pulls about 7-9 of vacuum and crusies at 17. I'm sure if you have deep pockets you could easily get 650 or more. Chris (440Pursuit) had a nice 509 cammed 440 set-up running 11.80's in a 67 GTX.