[motto]

Thanks Phil, the information you've provided has relevance to me also.
Last year I purchased a 1945 G506 Chevrolet 1-1/2 ton 4x4 from a fellow in New Mexico. When I drove it home from the import agent's premises I was very impressed with the performance and on further enquiry was informed that the engine in the truck was in fact a 261. It seemed even more peppy than I would expect from a 270 which I am very familiar with.
The unfortunate part is the engine rattles badly on start up until it gets oil pressure and it leaks oil like the Exxon Valdez so I think it best if I give it an overhaul.
These engines are a rarity in Australia so nobody knows much about them. This one has an oil filter attached to the manifold and we were wondering if it was full flow with its large diameter hoses. That question has been answered.
I feel a little more confident now knowing that information is readily available (and I assume parts also) so thanks again.

David