Not Ranked
Could you not modify the pan with small holes and rubber plugs to give access to the idle mixture screws OR get the type that can be twisted with your fingers? There aren't a lot of things that need to be accessed? It would appear that the use of one really restricts the size of air filter, especially with a 427+ Inch FE. Seems like your'e having to chase your tail.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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