i bet you wont even net that kind of gain. 396 and 383 are heavier. and forged components on top of that are more so. all the cubes do is move the torque curve and by doing so move the hp curve down to a usable rpm limit. a decent cam on an LT will want to see 7k before its done making power. 383 will see around 6500 and 396 about 6k on the same cam(CC306). when i was looking. and thats not even a big cam no a days. i say 396 as its not any more then a 383 kit. and buy billet caps and have the block line honed and decked TO the rotating assembly. then you should be good. and if your doing any aftermarket clutch with an aggressive type disk it will chew up the stock flywheel pretty quick. so a new flywheel is needed Anyway.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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