There are quite a few out there but not compared to the amount of Cossies.

Not that many are prepared to pay the money, I guess. I got through over £6k by the time I had done exhaust, manifold, turbo, ecu, loom, injectors and mapping and that’s without the engine being opened at all, you can do another £4k on a standard rebuild and another £5-10k easy if you add Long studs, porting, oil squirts then pistons rods and crank and you easy go over....hence my new Engine was over £20k plus vat. You can obviously re-use the crank at 650 bhp ish but it risks the rest of an expensive build if you do the rest without changing a 20 plus yr old stressed crank.

What power are you planning and what spec of build in terms of cams, head, pistons, rods, crank?