Nitrous or supercharged engines affect converter selection. An engine with super charger produces more torque than it would if it was normally aspirated ( your running very low boost for a drag car
) That means a blown engine needs a converter with a lower stall speed range. Otherwise, the converter will stall too high, causing it to slip and the engine will rev too quick and eventually the converter will self-destruct due to the extra heat generated. Your converter may also be ballooning!
Whats the overlap on the cam, Or give he cam specs? Whats your compression?remember, with a supercharger you aren't relying on the natural vacuum of the engine to pull in air, it's already there and in more abundance than would normally be without the Super charger. that means it's going to force air out through the exhaust valve during overlap. excessive overlap isn't something you want on a boosted engine, supercharger
but aside from the overlap, it's not necessary to have your valves open up for so long either. those kind of cams make a lot of power really high in the rpm range, where superchargers start to lose efficiency. not to mention it causes a lot more stress on the springs since they have boost pressure to contend with also.