Hi JR, I too am interested in this conversion to a 99 TS - It has been done by an E European Indi - on Youtube (being driven).
So far all I have managed to get is hearsay ranging from ..you need to change so much it is not worth it ....to same floorpan, minor mods to eng mnts only...
I would have thought a cheap indi engine management ECU found in kitcar mag and race mags for c £200, custom half shaft mods, custom free flow exhaust + swap in complete 20vt with trick diff and box as a unit (clearance issues?)
Perhaps we can track down a suitable skilled enthusiast mechanic to carry this out - sharing 'development' cost will make it more attractive - sure we can source a pair of 20vt and have 'Flea' or similar check them over and tune to 340bhp (safe limit for std internals) - he has new super quick trick turbo unit and is one of the best for mapping them - he could no doubt source appropriate ECU and make interconnect harness to talk to Alfa system (not as if either are DBus!)
Really rather keen to do this if you are - where exactly are you, I am Corby Northants area - may be able to offer garage space to work on the 2 cars side by side if that helps keep mechanic cost down
This would have to be done on a very tight financial leash to reduce any potential non recoverable costs when sold - I would have thought: £500 for engine and box, £1k for turbo upgrade, ECU, map and used intercooler, £500 custom exhaust system, £400 eng mnts, gearshift + drive shaft mods..plus a negotiated private project cash labour rate based on doing 2 near identical cars (perhaps c £1000 / car?) - on top of this would be new discs and calipers plus suspension check / overhaul...already over £4k.... (£500 could be saved if a pre tuned engine in fair condition is sourced?) - without hidden costs it is already a little alarming as over half of that money wouldnt be seen again --- can you see a way of getting it done for less? D