Fix your 305. You are not ready for 400 horsepower and neither is your car. A motor that makes alot of horsepower is only part of the total package. Alot of power with a rear,trans,and chassis that can't hande it is still a slow car. Make a REALISTIC plan and stick to it.
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Just a street driven small block with a little spray 
7.87 @ 174 on 275 radials
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