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Here's what I got..67 gto..Mom gave it to me..I'm restoring it! I need to get the motor in before paint. It's mostly stock except the motor. The guy she bought it from put a 389 with 400 heads (670) on it. I put a demon 750 dbbl pumper on her and X piped the exhaust with 2 1/2 pipes out the back just because. Had it dyno'd and it puts out 255 at the tires. Not to bad..I want to put a 400 back in the ole girl and port and polish the 670 heads. I would like to get 400-450 Hp out of it. Is it possible? I need to know what I need in the 400 to get max horsepower! I only want to build it once..It's not going to get alot of drive time...Thanks for your help!!
 

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Well my dads Goat isnt restored yet, Im only 14,
So I dont know what it will sound like,
So for now, loud music! hahaha
 

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You need to talk with Butler Performance (Jim). Not only will you get some good info, they probably have one already in their inventory.

butlerperformance.com or 1-866-762-7527
 
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