Sorry, its a Walbro 668. I can't keep of track of all the numbers used for naming things.

If its the same bolt spacing I can fit it. My soon to be father in law has a small milling machine and an engine lathe, so I should be able to come up with a new spacer. Maybe make it 1/2 or 3/4 thick to get a little extra velocity out of the air/fuel charge.

Gotta tinker on the engines first though...