66 Cuda slant 6 for 289 Ford Possible???

Motor mounts and tranny mount everything else shouldn't be that big of a deal. You could even use the mopar ignition system with a little splicing here and there. Go with a slant radiator and the upper hose will be no problem, lower hose won't even be an issue. Distributer placement will be the main give away if it is dressed up like a mopar.