I was wondering where to get a crank pulley for my 451 (stock WP housing and pump, + 3/8" for the front plate).

There will be absolutely no room to space the water pump pulley forwards (viz. the HHR Fan thread).
So it's got to stay where it is.

The alternator of course can be mounted anywhere it will fit and spacing it forward or back is easy.

So that leaves only the crank pulley (non-stock damper too). Is it possible to use a spacer on the crank pulley, and if so where can they be had?
If not, once I determine the correct back-spacing where can I buy such a pulley?

Of course the other option is to have 3/8" milled off my water pump housing but I'll bet that costs as much or more as one crank pulley
thanks
Charles