you'll get a lot of opinions on this subject, heres mine.
your 4 core "should" be cooling the engine just fine based on your specs i remember reading. check all other aspects like water pump, pump clearance, fan location in shroud, fan clutch, t-stat, etc etc. especially if you are running straight water with additive, sounds like something else is contributing/causing the temp issues...
but yes, an aluminum radiator will cool better than the factory copper rads. anything from super expensive big row 2 cores, or if you are on a budget the 3 & 4 core champion brandss are a great value & actually very good quality & lifetime warranty. yes they are made in china & some frown on that, but again, if you are on a budget & want better cooling they work great.
have read about many guys with 500+hp engines that use them & love them. i have the 3 core champion in my 500+hp mid 11sec firebird & it does not move above the t-stat rating no matter what condition the car is in, 90+ degree humid days in staging lanes, stop & go traffic, prolonged highway speeds etc etc.
cant comment on a gto or other make version, but on a 2nd gen bird the fit was perfect.
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