I like the 318 idea. A slightly modified 318 can easily get you 300 HP with great reliability and decent milage. Then focus on carving corners. A nice 318 would give you plenty of power, and a great suspension would make for a FUN car to drive. I also like the idea of the turbo charged 4 banger a lot! I had a 1988 LeBaron Convertible with a 2.2 turbo, and I loved that car. It was plenty peppy bone stock, and there are lots of mods you can do. Then I would still go in for the corner carving suspension. If I were forced to choose, I'd go with the turbo 4. You'd have the only one at the next Mopar show.