lol here was me trying to get you to stick with the mk3 . if you do change to a mk1, you must take all the mods cons from your mk3, door lights, boot lights, electric everything , or you'll just feel let down even in a nicely upholstered car, you dont want to be rolling up the windows to ensure no rain gets in. I would first check the build quality of your mk1, ensure its viable within your budget. Decide on a conversion, 1.8T might work, VR6 will work and you can supercharge it depending on bracket work, of course all your pipe work will have to be bespoke. If you stick a vr6 in the back then