Here's where I mounted mine:
[img]http://www.chevyasylum.com/64c10/64C10_024r8.jpg[/img]

It worked ok, but the distributor was worn, so I have a nice new HEI distributor in there now:

[img]http://www.chevyasylum.com/64c10/64C10_044r8.jpg[/img]

That's been workin great.