I've got a 30 over 360 in my 'Cuda with the 284/484 Purple shaft cam, running 2.02 mildly worked heads, a M1 dual plane intake, Hedman headers, a 650 Holley DP, and I have had both 3.55 and 4.10 gears in it (4.10's are in there now). I really like the combination, and yours is very similar except for the gears, intake, and vehicle weight. I could probably get a little more performance with a Holley 750 DP, but it's strictly a street car and the 650 works fine. It worked very well with the 3.55 gears, and then really woke up with the 4.10's, so I agree that you may need more gear, but you might be OK with the lighter car and 3.23's