I don't think you'll gain any RWHP converting to a C4, I think the AOD is about as efficient as you get for an auto.
Hopefully you'll be able to find a clean car, I'll keep my eyes open for you.
Have you considered buying the wreck of your old one and transplanting everything into a clean 4cyl. car?
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393W: AFR 205's, hydraulic roller, TKO600.
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