a couple of other things you need to know, you may have to change the valve cover for the 4 bbl so the throttle cable will have the pivot point to attach to, you will probably need a longer cable also as the 4 bbl cable route comes around the back of the motor and cross the engine from the port side. Before you get to far inot it, have someone check the 4bbl carb out for you, if its junk theres no reason to go any futhur unless you want to spend the money on having the carb rebuilt or replaced
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