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This is a good strong setup for the street and occasional race. It is too heavy for an all race car. - Stock 455 block and crank. Standard bore Speed Pro L2359 forged pistons for a 455 PONTIAC. Stock 425 connecting rods. You will have to do a little notching on the inside of the block to clear the rods. No fancy offset grinding or anything. You will need to run race gas or at least mix it. You will definately need a bigger cam and probably a better fuel pump. I`de get rid of the Holley and have a Q-Jet professionally done.
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