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I agree with Doug. The 2.2 in my '70 is still going strong but it definitely smokes on decel and other indications of wear. I've started a fund to install a 3.2 or a 3.6 eventually (not sure on carbs vs. injection). As you mentioned it is more cost effective to install these later motors than rebuilding your original mag case engine for more performance.
I have a '74 915 in my 1970 911 and you can see where the tunnel had to be massaged. It doesn't look like anything severe but it's definitely there. I'll keep my 2.2 around and rebuild it eventually.
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-Jess
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