Well this is something i like to hear about! i've been workin on my GTP for the past 3 yrs...after about 7k spent one hell of a ride i ditched it...L67 and L36 and L32 (04 up Grand prix) engines are my specialty...first Dan your wrong on your HP numbers unless you were meaning crank...the fastest Grand prix to this day is a 10.19 fully built race car turbo'd grand prix about 535 crank HP i think it's around 580-600 now...second fastest is a 10.97 with about 410 hp on a stock ported M90...good choice on the engine...these blocks can run FOREVER...easy to replace...and the aftermarket is coming along...if you decide to mod this engine at all..give me a email..i would like to chat with you to make sure that you do it correct and don't blow up your engine!...Griznak32@yahoo.com...have fun and enjoy the "wwwwwwwwwwwwhine" smile

Clayton