Newbie here - can you help ID what I have?

#1
Recently purchased this sight unseen off Craigs. The guy didn't think it was a Bonanza, BUT doing research on the site, it's definitely a Bonanza (based on the small Bonanza ID tag on the engine plate). It's unusual in that it has a springer front end and a hard tail rear. It looks like it has a stock kidney bean front wheel and the rear is something that was hacked together. I'm guessing it's a MB300 and I'd just like your thoughts on if I'm correct AND if you have any clue about what year and how rare it might be. Here are some pics:

20170404_193256[1].jpg 20170404_193357.jpg 20170404_193337.jpg
 
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