My 60 foot so far has been abysmal.1.6 seconds. I'd expect with the transbrake I'll see more in the 1.4 range and possibly into the 1.3 ish range with a 4000 stall if I do decide to go that route. . i also feel the cam was a bit large for the heads on the 496 given the converter and with the 540 and 325's it will be better sized throughout the RPM range. I discovered the cause of the 496 failure which was a vent tube came off the carb and into the engine. I'm sending it back for a refund to summit and I am in talks with the manufacturer of said piece of poo. Picked up a pro systems 1050 so a little more airflow on the top end will be appreciated.