I have upgraded my 90bhp ALH motor to about 130 bhp and now i need more stoping power. I will change the front brakes to 4 pistons from Brembo or D2 but what can I do with the rear drums? Can they be changed to discs and what would I need?

rear brakes only do about 10% of braking, and with only 130bhp dont need upgraded, i wouldnt go for any more than a vrs set up on the fronts

Or get some uprated pads.

That will be cheaper and easier

On re-reading this, IIRC you could fit larger diameter front discs (256mm to 280 or maybe 288) for the price of discs, new pads and a new set of caliper brackets.