Well, if you're going V8, I'd say a 306 or 347 with efi backed by a T56. But, i think the Mustang's 3.7 (as mentioned above) would be cool...or, what about the NEW 2.3 that came in the 06-12 Ranger? My buddy had an 07 XL 2wd rcsb with the 2.3 and a 5-speed and let me tell ya, that truck would get down...i can only imagine that in a lighter Pinto. Now, when i say that, i mean electronics, fuel injection and all swapped in...i love retrofitting newer elements into older cars and making it look factory...can you imagine? A stock looking Pinto, hopping in, firing it up and still hearing the familiar 2.3 under the hood purring like a kitten, with no drivability issues, getting 30+ mpg like its nothing and moving the Pinto like its never moved before...all while appearing stock...man, now I'm daydreaming at work again!