Check out British Motor Sports in Campbell 408-370-7174, Dave has
one sitting on his shelf (bare). He's very likely willing to work
to match prices. If you don't already know him, tell him I sent you.
I operate on the prinicple that if people tell my pushers, er parts dealers,
I sent them, I'm likely to get a better deal. :)
As to the rimflow valves, I have a set that I bought when I was going
to be doing a new cylinder head. That project is postponed indefinitely,
I'd be willing to make a deal on them, make me an offer.
For that matter, I might even be willing to part with one of my spare
cast iron cylinder heads if threatened with enough pictures of the
appropriate dead presidents.
The person who dies with the most toys doesn't win. The winner is the
person that has the most fun playing with toys, whoever they belong to.