that all depends on your heads and cam setup
i ran with HUGE valve relief so i never needed to worry about PTV. But if i ran a Much bigger cam id be in trouble. it ALL depends on top end for ptv. if your gunna spray id say stay in the high compression ratio mostly stock if not stock heads and a mild cam. and you'll be alright.
SRP makes a GREAT set of entry level/cheaper pistons with a good relief and setup for 355 with a 5.7 or 6.0 rod depending on what you want to go with. id say longer rods would be better to keep the R/S angle a little better for a Hit of nitrous.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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