Brent,
Welcome to the board.
Sounds like you have a great plans for your "big" car. I plan similar mods for the 68 GP that I am restoring. One suggestion I would make is to consult with one of the widely recognized Pontiac tuners such as Butler, Nunzi, Kauffman, or PPR here in SOCal. I think you will find them competetive and more knowedgeable then a generic provider like PAW who sometimes uses "budget" parts in order to offer low prices.
I would consider using one of the drop-in 455 stroke cranks as there truly is no substitute for cubic inches particularly in a 4,000 lb. car.
Beefing up the trans and handling is a great idea and often overlooked as performance is increased. Are you planning on upgradeing the drums to disc?
Les
66 GTO Coupe,455/trips,700r/2500stall,12bolt/3.08,1.79/13.01/104.5
68 GP daily driver and 2004 Route 66 Tour participant under restoration
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Better lucky than good
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Les Iden
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'65 Buick Sport Wagon Custom, 340, T350, 3:23
'66 GTO Post/468, 700R4, 3.31 (Mike's as of 9-16)
'68 Grand Prix/455, dual AFBs, T400, 2:93 posi (sold)
'72 TA tribute/461, T400, 3.08, (Russ's as of 9-16)
'97 Mitsubishi Eclipse Spyder Turbo, Konis, 5 speed
'09 Torrent GXP, nav, Sun & Sound pkg., Bilsteins
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