What engine for my dart?

wow thanks for all the replies, didnt think i would get that much. Well a litle history on the swinger. I Bought it when i was 14 had the 225 slant 6 with a 904. fixed it up and drove it for a couple years, oil pump finally went out on the 6. Droped in a mild 318 drove it to college. Then my sophmore year i was rear ended by a guy who had an insurance card but no insurance. Turned into a 9 month debacle with insurance.

By then my "restoration" started showing it flaws (and 14 year old funds) so i decided to park it and save up enough to "do it right" well six years later im starting on it.

I've actually thought about going the diesel route but the diesels weigh as much as two big blocks. Lately i have been thinking about the 2.4 route as well. The biggest fear i have is building a great engine and i cant even drive 100 miles before filling up. Especially since i dont plan on selling it.

On the parts list i should also add

4 speed pedals
Holley street dominator intake for the 400