That ZZ motor is an excellent choice, as is the Richmond and the Dana 44. It will make a good street combo. With the right gear spread and differential gear, you can get real grunt off the line - and good cruising mileage with the overdrive. A trans first gear in the 3.0 - 3.2 range, and an even spread up to 1.0 in 5th and an 0.6 - 0.75 top gear would work pretty well with a differential ratio arround 3.00 - 3.50.

Decide how much grunt you want off the line, and talk to Richmond about the right gear spread in the trans.

With a 3.2 low gear in the trans, a 3.55:1 posi will act like a 5.16 behind a Muncie. Even a 3.00:1 posi will feel like 4.36 gears.

With that combo, that 1st year C4 will kick a$$ and take names.