Call the guys at http://performancesuspension.com/ and discuss your wants with them. They sell a wide variety of springs and can recommend the right product. There is a lot of stuff out there and its a crap shoot unless you deal with this stuff every day. Unless you are going from a 6 cylinder to the 461 or made some other changes like Brad noted in his reply the car will sit normally with stock springs. There is not much difference in the weight of Pontiac V-8's 326 up to a bored 455. Normal is however just slightly "up" in front. Correct spring selection will put it like YOU want it.
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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