would sorta money would i be looking at ?

and what sorta power gains ?

You could get a set of single injector throttle bodies for £500, and then spend another £500 on a remappable ECU with a basic map.

After that, some rolling road time, another couple of hundred, and with a Shrick 268/268, 4 branch and full system you'll probably be looking at 110-120 bhp or so.

Don't know where you'll get a manifold made up though I'm afraid. I think Yoof is your man, he's got some experiences of GTs on ITBs.

manifold would depend on the bodies you choose. you could use a twin weber manifold and have some injector mounts machined into it. or get a custom one made, etc etc.

dont forget the amount of wiring required to run a mapable ECU and all the rest of it

Yoof ran his mk3 on throttle bodies. He'd be the person to ask.

Sorg do a 90 bhp kit with Weber bodies and cam