Two new t-stats and new waterpump can't be faulty, right? (8v)

[area53 at validpath.com (Jeff Toomasson)]

My mk1 had been running quite hot. I noticed that the flow to the 
radiator had been pretty meager. Decided that the waterpump should get 
switched out. Found one (and a t-stat) on ebay for $20. So, I finally 
get the opportunity to install the bugger today and I get no flow (that 
and makeshift pulley assembly I had to fab because the STUPID PO used 
some mish-mosh of pulleys AND BOLTS (not allens) on the crank pulley!!) 
I even switched out the t-stat for another new one I had lying around. 
Nothing. Is drilling the t-stat recommended for 8v's too?

I'm even debating switching out the radiator. Any ideas??

Thx, JT

PS - Ron/Brett if you're out there, I haven't forgotten about you guys! 
(dealing w/ ailing child (I know you know what that's about!!))  :)