I ran the last engine in my 300D with one tooth off after I screwed up removing/replacing the cylinder head. It ran alright one on the road but shook like crazy at idle. I still have the old pistons, they have little exhaust valve indentations in the tops of them that I suspect could be machined out without a lot of trouble. I've been thinking about having the cam set one tooth early like yours and feel that it will run like that but I don't think it would be making the type of power that it should be capable of when timed properly. I'm also thinking that ever who got it off probably just adjusted the ip to get it to run "good" but this is only speculation. It is easy enough to advance the cam sprocket/chain relationship one tooth and then see how it runs. Will be interesting to see if you have to make an ip adjustment.

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Jim