McCulloch pro mac 250 (canadian)

[Fudog]

I have a McCulloch pro mac 250 canadian built and I would like to know where I could get parts for it? It was given to me about 10 years ago and sat in the garage the whole time and after a recent wind storm I decided it was time to drag it out and get it running. It took alot of cranking and a squirt of ether and it fired up. Then I got interested in giving this old saw new life. The chain that is on it is a Stihl .404 pitch, 6 guage with 61 inside teeth and I cant find this size chain anywhere.Parts such as air cleaners, spark plug and what the proper gap would be, a clutch or a sprocket and any other parts that would need adjustments such as carberator but mainly a new chain. the bar is in good shape. Any information will be greatly appreciated. An owners manual would be great. This is my first post on here. Thanks!