With the auto, there isn't much gonna help unless it's forced induction, One major restriction on the lima, is the head, it doesn't flow well. A port, and polish, cam, and header would help, there are also aftermarket heads available.With an auto tranny, a turbo would be your best bet for any real noticable difference. If you had a manual, I'ld go with some bolt on's, and head work. Maybe others will have some idea's.