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I don't know much if anything about carbureted engines unless they're single cylinder , I'm with the others, hard to tell unless you pull the head, a boreoscope might help but probably still hard to tellScotts90ranger can help you with informantion concerning turbos and turboing the 2.3
Well with the draw through setup, the carb doesn't see boost so the seals aren't really under any pressure. But I heard the fuel running through the turbo eats turbos pretty quick, probably the reason nobody uses them much anymore. And I believe the draw through 2.3's had the turbo made into the intake manifold.