try to find a decent set of heads. If it were me, I'd look for a used truck motor w/vortec heads, have the work done to the heads (.500+ lift cams), bump the CR to around 10:1 and use a roller cam like the Crane 119831.
I ran the same cam in my 406 when it had stock 400 heads that I hogged out. It smoked the tires infinitely before I tubbed it out. I didn't have any cooling issues even using a Camaro radiator. I did buy the appropriate valve springs for that cam though. You'd probably be suprised how good it will run.
Definition of "Trailer Trash" (tray-lure trĂ¢sh) A Mopar after the 1st round of eleminations at the drag strip.