Im really sorry if im asking questions which have been answered already, I have searched through the site and Google and cant quite find what im after!
I recently got given a low mileage solid MK3 Fez its the 1.3 HCS (which definitely doesn't stand for "High Compression Sport")

I want to have a bit of fun with it and drop a 2.0 silvertop in but leave it looking completely standard (apart from some wider steel wheels and obviously some bigger brakes.
I know this is a tried and tested conversion so ive been doing research but still have a couple of questions...
Is it worth it?! How do they go with a 2.0 lump in, i take it the fact they weigh very little helps!?
Can i retain my gearbox for shorter ratios, if so what clutch/flywheel set up do i need?
Do i need to change the fuel tank or lines?
Any help would be apperiated