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I have a stock 70-440 take out motor that is low miles and in excellent condition.

My thoughts are to keep the stock shortblock, except a 268XE Comp cam, a CH4B intake, 3310 holley, factory magnum manifolds, and stock Eddy heads with a true dual exhaust.

With proper tuning, can I expect 400 HP?

Anyone else use Eddy's on a relatively stock motor?

I do have a good set of headers also, but would prefer to use the manifolds.

All going in a 66 Coronet.

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Yes - you can achieve 400 hp with what you plan without the headers. Make sure that it is a true 10:1 CR, maybe 10.2:1 when you are done and feed it with a good carb. It might also respond well to milling the divider or adding an open spacer. Test to know for sure.

Depending on weight, converter, gear and tire, you may or may not be able to get into the 12's.

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