I had a Mk2 GTI with a VR6 engine conversion.
Its not that quick, but packs a punch thanks to the torque. Also bearing in mind the engine was in my light mk2 gti and the mk3 is a much heavier car
The amount of fuel it drinks to get there is not very good, Id say the VR6 was thirstier then my Escort cosworth!
On the up side, mk3 golf parts are readily available and cheapish.
Dont be fooled in to a highline being that special, all it is are a few bits of extra trim, not worth the extra premium at all!
As has been said cheak the chain, the runners/tensionars are what normally fail.
Also listen for a tappety noise, showing high mileage.
And also blue smoke on start up means the engines done a fair bit of work.
If you have a bit of cash spare and looking for a cheap toy the the VR6 is a great buy, but I gurantee you will probably sell it due to the amount it drinks!!!
The car on a whole offers a lot of fun for very little money tho
And what id do is when the mk3 body dies, shove it in a mk2, you wont be dissapointed!
BEST BIT BUY FAR IS THE NOISE, put a induction kit on listen to the engine roar!!!!!