I run a QF 4150 950 on my 499" in the Challenger and have been happy with it. It reacts to changes well. Also run a QF 850 on my Mom's 362" Duster and was faster than the Holley 750. I thought it might slow down because I figured it would be to big for the motor.
2013 NHRA D4 Stock Champ #4 in the World IHRA Stock 2x IHRA Div.4 Stock Champ 14x Track Champ All using a Ultimate Converter Concepts converter. Call Lenny today 704-892-6837