Stock 454/330, besides the block, is there any place I can pick up water pressure? I was thinking on the side of the thermo housing where I currently have a plug but not sure.

the sea pump,their may be a spot (1/8'' pipe plug) in its place already.

I take mine from the intake manifold. There is a plug beside the thermostat housing. My manifold is a Dart, so I don't know if you have the plug or not.