Paging CardiacPaul, aisle 3 clean up! He knows his A4's and visits here sometimes.
I would never have thought of posting your thread as a poll. It would be nice if there were a best choice of engine to start with but you have plenty of parts or so it seems you should be able to build 1 working engine from what you have.
I suggest that you post this question over at the Moyer Marine forums as well. The motor heads over there will want pictures of all 3 engines and while the advice may not come so fast it should be good as those guys know their A4's and many have done re-builds.
The description of the 3 engines is helpful but pictures would be even better.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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