Getting worried-----

I just printed on off from here and pasted to thick poster board, and used the crank snout bolt and washer to hold it on. You have to place and cut the center hole very precisely to retain accuracy.

http://www.machinerycleanery.com/DWUniversal.htm

Cc'ing the below deck volume of a cylinder with piston at TDC would be good too, due to the vague info on the Egge piston volumes. Pretty easy to do if you can cc the heads. Or use TMM's method. (I have never done that one....)

And if you don't put in maximum ignition timing, that can help as a stopgap or permanent fix for a bit too much DCR. Or change cams. It is not a disaster at that level, just a revision.