NEED SOME ADVICE PLEASE

[66gasgrill]

I'll give ya another vote for the C4- STAK B Box 3 speed. the B box is designed to fit in an early Bronco and you can get it in

5.44:1, 3.05:1, 1:1

4.33:1, 2.43:1, 1:1

3.75:1, 2.05:1, 1:1

0.79:1, 4.33:1, 1:1

It's clockable in 4* increments and requires no adapter to mate it to a C4.

I've been thinking about putting a doubler between my Np435 and D20 but this might be a more viable option.
It's alittle pricey but when you compare to an atlas a doubler and built D20 it's really pretty compareable.