good stuff! any pictures of it?
G60 injectors will just be matched to the ECU chip in it. Not really anything to do with fitting a g60 g-lader. It is possible to fit a g60 but it's not a small job fair a fair bit of custom work needed (bracketry, pullies, belts, boost piping, intercooler etc...). The biggest issue will be reliability though, the g60 blower has a bad enough reputation for reliability on a golf or corrado tall block. On a small block, fast revving engine they are even worse. If your target is 160-170bhp this is achievable with a g40 g-lader and will be more reliable. You will probably need a ported head and bigger exhaust valves.
As for the brakes, wilwood still make midilite 4-pot calipers but it does seem that rally design dont list the 256mm mk1 golf conversion kit anymore which is what also fitted on g40s. I've had these brakes on mine for years and whilst they are great I think they are overkill for a road car with 160-170bhp. I would say just stick with the 239mm brakes but use some decent pads (everyone has their own opinions on pads I always liked ferodo ds2500s on the 239mm), decent new discs, braided hoses, new decent quality brake fluid. Replace/refurbish all the components of the drums on the rear, the rear brakes do very little on such a light FWD car like a g40 but if they are in bad condition they will affect the whole braking performance, pedal travel etc... Using a bigger master cylinder will reduce pedal travel but mean you need to press the pedal harder, it's a personal preference thing which you prefer. If you do want some bigger discs then get hold of the audi 256mm caliper carriers, various posts on here somewhere about using those with the 256mm discs and correct calipers.
For suspension, I would either go for a decent quality set of coilovers (which is definitely not ta-technix) or for a lot less money, decent quality shocks & springs kit.
