[Bill V]

Chifo, hcollado is right about Roscoe. The link I put up was Roscoe describing what seems like the exact problem you're having. Roscoe provided a story for the the latest (September) issue of Kit Car magazine entitled "Coolin' It" which runs down every step of his nightmare in a more concise manner than his original thread. What he found, according to the article, was that the Edelbrock 8844 waterpump he was running with was designed for a 351 Cleveland. The only problem was that Roscoe had a 351 Windsor in his A & C Cobra replica. The problem went away once he installed the Edelbrock 8841, the right one for a 351 Windsor. The kicker is that the two pumps look very much alike. Anyway, it's possible that your problem is something similar.

Do yourself a favor, before you tear anything more off that engine or needlessly sink anymore money into unnecessary parts, check and see what water pump you have currently and make sure that it's the correct one for your application. Hang in there.