Another detail: Be sure to use the timing cover, water pump and crank damper/balancer from the '71 350 on your 428 to make sure the accessories bolt up and line up properly.
428s were built only from '67 through '69 and there were several different timing covers, balancers and water pumps used during those years that won't match up with your '71 stuff.
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My wife says I never listen to her, at least that's what I think she said.