[Roadsters] U20 - Cam Broke - Valve Worries

[nmleeds at mindspring.com]

All,

Continueing on the saga of the U20 -> U10.  It wasn't the carb.  It wasn't electrical. So I took off the valve cover and found a broken cam.  The video is good for laughs.

That raises a couple of questions:

1) Any ideas why my new cam, on my freshly rebuilt (5,000 mile) engine broke? What should I look for and address before putting a new one in?
2) Should I be worried that the snapped cam might have caused the pistons to hit the valves?  I noticed a the sparkplugs on the 3 and 4 cylinders were wet, and worried about valve, valve guides . . .
3) Any thoughts about what cam I should put in as a replacement?
4) And, does anyone have one cheap they would sell me?

Nathaniel

'69 U10 

Status: Parked.