Since you asked, the RML GT40s had ZF transaxles - correctly mounted, Mathwell or Ford Motorsport 302 V8, Weber 48IDA carbs, Stainless Steel bundle of snakes - Hayward & Scott I believe, lightweight fabricated steel rear uprights, proprietary cast bellhousing, right hand drive with rod action right hand shift, proper brakes and rose jointed suspension all around plus an astonishing level of fit and finish.
A roll cage was fitted adding strength to the chassis, suspension pickup points were moved to optimum position using state of the art computer modeling. Very cool and effective cars.
Ray Mallock built a few cars in between Aston Marton and Touring Car race programs. Quite a bit of influence on the RML developement work done for Saleens S7 came from the GT40 project too...
Cheers