I posted a question earlier on about put a nos carb on my truck it was a carb for a 261 or larger six. The engine is a 235 1962 with hydralic lifters. I was having trouble with the modelB leaking bad &running rich i found a carter online & did it over.no leaking ,ran like crap.& hard to start. I got desperate because a car thing was coming up so i bolted the nos carb on &WOW this truck never started &ran like it does now.Since i do not go very far like a trip, just around town i am going to leave it on the engine for good. I can not believe how much better this engine runs. Am i doing any harm to the motor with the nos carb. THANKS BJF