hey i got a 302 now that 30 over mid cam summit raceing intake but im pulling it out i need MORE POWER .plus it recently its started to have a lot of blow by i mean alot so whats your opinion on what build i should do well u know i have the block for building up a 302 or 347 but the 351 i can get for $200 bucks but 302 i would be puting on gt40p heads so i will have header problom but i would just get some made the 351 will be a very tight fit in my 63 1/2 comet the 347 i just dont know much about on building one the 302 if i would build it will makeing about 400 to 450 hp depending what options of parts i go with. the 347 and the 351 i haveent checked on parts yet but my goal is no less than 400 hp with good torque. so what do u think.