I would go for the GT3071 but speak to a mapper regarding exhaust housing sizes as you can get down to a .63 - go for a set of Siemens 83's if you can source some if not again seek advice from a decent mapper for an alternative, they may advice 55's.

If your engine is standard with no valve cut's then a Kent AB07 inlet cam is about the best on offer

A 4x4 inlet with a decent spacer is more than enough