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With K heads it is probably 8.5:1 cr. Edelbrock makes some respectable aftermarket stuff for Olds but the 600 cfm carb is a little small for the 455, it might be ok with the K heads since they are not flow monsters.
But what is more important, do you enjoy the car? Is if fun to step on the pedal? If so, then no need to change anything, any 455 is going to have more torque than the average engine today. Welcome to our site.
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Dan
'46 2 door
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