Won't start

FrozenCaveman said
I drove the Scamp to work today, so I just went outside to check. ;) The puck has a large breather hose to the air cleaner and maybe a 3/8" line to what appears to be a vapor return to the fuel tank.

Read about it here.

A separate PCV hose, also maybe 3/8", goes from the PCV to the base of the carb. The port next to this is where my distributor advance line is hooked up.

That's all correct.

Both of these ports face the valve cover. On the opposite side of the carb, there's a blocked off vacuum port.

That's suspicious. Show us a pic, please.

port on my carb next to the PCV connection is ported vacuum (rather than manifold vacuum)?

Correct.

If it's ported vacuum, then it could be 6" at idle, couldn't it

Yes. That's somewhat of a little more than you'd like to see, though; it suggests your adjustments (base timing, idle speed) might not be set correctly.