Hey folks!!

Been looking at this forum for a while now and been doing my project golf up for about 7 months now, but I haven't post anything yet. Looking for some advice on a few things... Firstly, my car is a 16v KR Gti. When I sold a couple of old bit to a guy he had a look at the car and was telling me that I can bolt a 9a bottom end straight on and it'll make a huge difference. I've had a look through the forum, and am I right in assuming that I can just bolt a 9a bottom and ( using a 9a head gasket) onto my KR cylinder head and keep everything else?

Just wondering as I've already spent a good few quid on my clutch, gearbox, cylinder head and other ancilleries and don't want to have to change any of em'. Also, does anyone know of a company that sells 9a bottom ends, reconditioned or otherwise? Or is it just a case of keeping my eye on the classifieds?
Secondly, The cars going to need painted soon and will also need a bit of bodywork. I've bought new boot and front wings but its going to need new rear arch panels cut and welded in, as well as probably 1 sill done. I'm also after getting a wing vent put in and the fuel filler changed before getting a full respray. Can anyone recommed a good bodyshop either in the west Lothian or Glasgow area that would take on the work and make a good job? I know a lot of these places now are just after jobs from insurance companies as thats where the money is!
Any advice would be greatly appreciated. Cheers, Fraser