I got a 351 windsor Any Tips on pressure testing the cooling
 

One of the frost plugs was removed or popped , its a 69 351w out of a Fairlane, sat under a bench since the 80`s, has stock 4bbl and was complete minus flywheel /flexplate, so I need one of those too!! If its a good block I will rebuild it and race it, if not back to the 5.0!!
Thank You for your help!!! NPG

I would have a machine shop check everything out. Which plug was missing?

It would be a good idea to get that block checked over real good by a reputible machine shop, more than likely if it was in the car when it popped the "freeze plug" out, it was full of water and NOT antifreeze, the likelyhood of the block being cracked is high.

Goodluck>Cp