The hole spacing per the info provided with the engine says it should be 1 7/16" or 1.4375. By my measurements with dial calipers it is 1 15/23" or 1.468. My measurements seem to be correct with the engine and the drawing provided. Bisson closes at noon on friday so I missed them but I did leave a message with the diminsions so hopefully they will call back next week.
This plane came with a wood motor mount. I don't remember this on the first plane. I will switch it out for a GP adjustable mount. I already have it on hand. Everything else looks good from there on out.