Vixen

[pistolar]

I have a 1300 Vixen which iam fitting a 1700 Burton Crossflow engine into complete with side draft webbers. My questions are:

1. Should i fit a sierra diff for reliability? ratios? fitting kit?
2. Should i fit a five speed box? ratios? fitting kit?
3. If i keep my crossflow gearbox how do i convert to hydraulic?

Thanks