You'll be surprised though, that's why I'm asking. I've been seeing nice mk1's and 2's going for £6-8k on stock engine good nick but not even showroom condition. These type's of conversions were £6k for a 150hp one pretty much when I was doing them 5-10 years ago and even now they seem to still be £4k+ and we're trying to work out some decent costings as they're getting loads of interest - thought I would look for an impartial VR owner view point!
I think figures bandied about are like £3k for a 150/180 to £3.5k or so for a ko4 set-up, I can map them up to a Stage 1 too for like £