Got a rebuilt 6cyl head for my '66. Took out all valves and testing for specs, everything seems good so far. But, its been sitting around for some time and one intake port has some surface rust on it, not in the value seat however further back. Should I just take a few cans of breakcleaner to this or take it too a shop to have cleaned, boiled, checked for level, etc. Really new to engines so could use some advice. Thanks