NO offence martin but had you put it up here first it would have had a differant response. When i see stuff posted directly to Ebay my lights go straight on, it usually means there is somthing about the bike the seller is questioning in there own head. IF its on the public domain first its open to discussion.
IM cool that you have done the $80 worth of bearing and seals, most seller dont on a rebuild. they slap in some rings and a piston and call it so.
Good luck with the sale now we know whos it is. Im good for $3500 ! or i can swap you a YZ250 B frame for the YZ360B, i got a YZ360 B in my race bike and also have a 250B frame, kinda in reverse huh.....
might be easier for you to sell if its one way round, and matching prefix at least, if you got the engine numbers ill check my frames incase i have it here.
I found a MX360A bike i had bought from Perth in 2007 after ridding it for 2 year was the matching engine from another MX 360a i was alos racing. So it very very possible if it hadnt happend to me already once....