Hello all, I am in the process of cleaning and checking out my 1989 Conbrio (351W) after it has sat for roughly 2.5 years while I built my house. I found what appears to be coolant in the bilge but I can not confirm so I am looking to pressure check the block. I understand I can pull a hose after the raw water pump for supplying air to the block, I am confused as to how I can block off the manifolds to prevent air leaking out the exhaust pipe. Has anyone pressure checked their block or do you just run it on a hose and watch for leaks?

Thanks in advance!!