My son and I are planning on this build and we are at the stage of initially getting the main parts, namely engine, transmission and rear axle. After much discussion and consideration we have bought 4.6l 3V with 5 speed out of a 2007 mustang GT that had clocked 115k kms.
We did get a complete wiring harness, ECU etc with it but no key or ignition switch, hope this is not a big mistake. We also got the fly by wire gas pedal, rad and fan, power steering rack and front hubs and brakes which it appears we can not use on the Mk 4.
I realize this is a big challenge for us but nothing ventured nothing gained. We have perused the forums and realize there is a wealth of info in this community and hope we can tap into for help that we will definitely need.
Once we have settled on a rear axle we will order the kit. we are leaning toward IRS at the moment.
I know the 4.6 3V motors have issues with fitting in, headers etc. but we hope to be able to work around these as others on the forum appear to have done.
Errol and Roger