I would build the 428 for the added torque/hp but if you’ll use those 670 heads(Rated factory at 10.75 compression)they are no fun for todays pump gas. I would install custom dished pistons and aim for a true 9.1-9.5 compression. You can then use normal pump gas instead of octane additives and race fuel. Either way it will cost you money but less grief at the pumps later on.
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