Mine works great! I have a Eddy air gap intake, stock x-heads, 750 vac sec Holley, 3,500 B&M stall, 3.91 gears, that big 74 B-body runs really strong with that combo.
I have an Isky .505 cam in my 340 in the Valiant, that cam has the old school grind and is a different animal, only regret is that I didn't go with a solid cam in that engine....but will eventually. :glasses7: