Yes you would be able to supercharge it. Yes it can still be on an auto tranny. All 7-8 second cars on the tracks are mostly automatics. Yes the tranny can handle the power but you would have to upgrade the gear ratio. If you really needed to change the manual non a b18b it would roughly be at least $800, depending on what you want out of it. Instead of doing a b18b swap do a mini me swap (dy7 block with a dy8 head). The only downside that I can think of is you would have to buy new motor mounts.