Renegade Hybrids and Kennedy Engineering (KEP) would be the places I would talk to.. They have been providing a solution for the installation of these engines into 944's for around 15 or more years.
If you do some searches on the internet, you might stumble across lots of "arguments" some of which valid, some of which I believe were generated, because it seems at some point both these companies may have been in bed together, and during the "getting out of bed" with each other phase there was some serious bitching.
But I would take much of what you might find with a pinch of salt, as both companies are still running, and if you research the complaints fielded against both companies there seems to be no trail back to the persons making the complaints and both companies disputed that the complaining customer existed.
All very complicated, but at the end of the day I would trust buying off either company having read between the lines.
Having said all this, to be honest I do not think any of it is rocket science... A remote servo solution for the brakes and someone who can fabricate mounts and adapters is all you need... Probably a less complex conversion than the guy who was on here putting a lexus engine into a 944.
Do lots of research, see what parts are on offer, look good and hard at them and decide if you want an off the peg part or what you can learn from what you can see from the available parts and make your own.
About 20 years ago there was a British "person" called "Adie the Throp" who used to hang out at santa-pod with a Rover V8 powered 924 CGT who did some other 924 and 944 conversions... there were some breadcrumbs of info on the net about those cars and how the conversions were done.. well worth a read if they are still online... Last I heard, Adie the Throp was now living in Canada and rumours go around what sex "Adie the throp" was, is or has been!
Nothing quite as controversal than people putting V8's into Porsche cars, and often it is not the fact of transplanting an engine which is interesting, but the unusual gossip that is behind them!
