66 Valiant
I've had some 66 Valiants, still have the convertible, and wish I had them all. I had one with a 273 4-bl and it beat 283 Chevies and 289 Fords right and left. One day an acquaintance came up behind me in a 66 Valiant 340. I stomped on it and he went around me like I'd hit the brakes instead of the gas. I'd definitely go small block but, if you can swing it, the biggest small block you can afford. I still would like to do your project.