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ya hp calculators are garbage. i'd have to say about 290-310. but if you haven't gotten your shiitt dynoed tuned ever with all those mods , wow your gonna get a huge gain. probably 30 rwhp. .... maybe.
I would also condsider a aluminum driveshaft and a tubular k-member...the less weight the better...Mayber upsize your injectors to like 24lbs if your using nitrous often..and you should be in the 350-375hp range with a tune and should be able to clock some low 12s with the juice flowing.