Jeff has a some assembly required challenger for sale. E bodies are excellent for AutoX and Drag Race. I know a few people that built thier's for both. As far as engines go, for drag racing I'd say stick with the big blocks. They are easier and cheaper to build up than a small block. But Big blocks are harder to put in an A body. Less room and expensive motor mounts. When I say Big Block I am refering to 383, 400, 413, 426, 440 and of course Hemi. Small blocks are 273, 318, 340, and 360 (pre 92)