EZ-1 Super Cruiser Weight limit
Assuming your talking about the older Sun EZ-1 recumbent, the weight limit is 300lbs. You would probably be alright as most weight limit are a "lawyer number" meaning that is not the maximum capacity but for legal reasons they set it at that. 

If you do get it i would recommend replacing the wheels on it at some point as the ones that come on it are so-so. And a heavier duty set of double wall rims and decent spokes would hold up a lot better over time if you'll be using it a lot. The wheels that come on them are Weinmann 519's which are a generic single wall rim. 

The good thing is most the parts are very similar so if you need something as a replacement more than likely they are still being produced and available. 

The company has sense changed it's name for recumbents to Sun Seeker, and is the house brand of J&amp;B Importers a national parts distributor who also owns Origin8. The newest owners manual for the EZ-1 Classic (very similar) can be found here