The cam on ebay is appears to be a 260 degree. You can go to Comp Cams' website and verify. I just put one in mine with a fresh rebuild. I like the way it runs except I haven't got it to idle where I want it yet. Not real bad, just not as smooth as stock. Some others on the forum say theirs will idle as good as the stock cam.
This is probably not the "biggest" cam you could put in this engine, but for an everyday driver this is a nice cam.
65 200 I-6
Comp 260 cam
'80 head 54cc's
.007 deck
DSII distributor with Blaster Coil
Holley/Weber 2v carb
stock exhaust (for now)