Thanks all for the excellent inputs so far. They are very helpful and will help with my future 400 build as well.

I have a 326 and the new pump is an 8 bolt cast pump. The two plates behind the pump look to be in real good shape with very little rust.

I was going to start a build up of 68 Pontiac YT block 400 next month. But as always, a priority gets in the way (I found my house's darn roof is leaking). So, back on the shelf it goes.