Are all gaskets the same as the 235, except for the head gasket on the 261? Where is the best palce to get a gasket set, online, or at the auto parts stores?

I also need the oil lines for the external filter?

I need to locate the three (rings) that are between the intake manifold and the head, I am not sure what they are called. I am missing one.

Any advide will be greatly appreciated.


Kevin & Cindy