I know this topic has been long been forgotten but I would just like to share my 2 cents of my opinion, Classics are classics but if there old tech would not keep them road worthy what's the use?, If I'll be having an old Stang, with no parts and just sitting on the garages, and paying it's reg every year, I would say I'll go for an engine transplant.A Nissan Skyline engine will be my best swap, rather than a gas guzzler Ford engine.It may de-value my car price but I still can use it with no problem (FAST & FURIOUS). But my options is to maintain the original appearance from the outside as ortiginal as possible. but all power from the inside