my absolute favorite of all time is a 427 cobra but the 390 460 429 440 455 502 were also very nice I know an engine that pulls quite a bit of torque for it's size is a 4.3 ltr chevy v-6 (I know because my brother has an astro with one in it and Iv'e felt it do 120 and it wasn't that hard because it had a little more to give even with that much weight.)And they are everywhere you can pick them up cheap at junk yards and play with them for what ever you want wether its work or play.