I'm looking for some extra input on 440 tuning and drivability issues. Working on my brothers 440 30 over 10.5:1 compression .494 purple shaft Hyd cam 452 heads and an offenhouser dual plane intake with a 600 com double pumper holley. It has a pretty bad stumble off idle. It's used to run really rich. I put a 3.5 power valve in due to the fact it idles in park at 10" of vacuum and 5" in drive. Those reads seem very low to me considering the small cam. Possible vacuum leak? Does anyone use gaskets with the metal tray gasket? The advanced timing is at 36 deg. I don't know what the initial timing is but I'm gonna look into that. I think the convertor is about 2200 stall. Is that not enough? It has full length headers if that needs to be known. Starting off from a stop light you have to pump it to go cause it stumbles. You cannot just ease into it. Once ur cruising it's fine. The motor is in a 33 plymouth sedan do it's a cruiser not a street / strip car. Any suggestions would be appreciated. Thanks
