383 Engine questions

Car weighs, per the service manual, 4200 lbs give or take. Tires currently are 235/70/15's. I bought a set of cragar s/s wheels with tires already on for a great deal from a local mopar friend. However, on the back I'm planning on running 255/70/15s when the rear tires need replaced.

As far as performance, It will do what it will do, as it will primarily be a street cruiser. The car is probably 400 lbs heavier than a charger? So I'm thinking that with the right power and weight transfer, which is what this car does well, I should be able to startle some 5.0 mustangs and late model camaros.

And to answer your question Terry, Yes I want it to be a sleeper, but the thing that this car does best is run down the interstate. It'll run 85 mph all day long and just floats over the expansion joints, which is why I dont want to go much lower than a 3.23 gear. The duster is my stoplight to stoplight ride.

Would something in the .230 at .050 hydraulic flat tappet be too much for 3.23 gears? My main concern in making the power is the 516 heads, I dont know if I can make them flow as well as say a 906 casting, but whatever head I have done, it will have harened seats and 2.08/1.74 valves. Thanks

Will