Several years ago I used an M1 low deck 4150 intake with an adapter and an old used 1050 and went 9.96 with a 590 cammed 451 and Eddy heads. I didn't try a 4500 intake but back then the guys that tested this were running best with the adapter and 4150 intake. Every combo is different though.


1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual