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Sorry, I know basically nothing about this, so please bear with me. I want to quiet down my car for a baby to ride in it on long trips. I ditched the Hush Thrush mufflers & now have stock style Walker mufflers with 2-1/4" tail pipes & stock chrome tips stepped down from Heddman 1-3/4" headers...

I believe I posted this before, but can't remember the answer. I am planning to swap motors & the new heads are Edelbrock E-streets with angled plugs (440 in 70 b-body). Each two pairs of cylinders angle in towards each other slightly. I would like to keep the same headers I have now (I...