New to Classic Cars / 74 Duster Restoration

Hey everybody,

I am new to this restoration thing, and have found it very time consuming looking for parts for a 1974 Duster ( 318 ). Currently, I am having a difficult time trying to find the correct crankcase breather with grommet, and, the correct pcv grommet size.

I would like to just replace the entire valve covers, but, the auto parts sites are vague in description as to what I can really put on my vehicle. Any Help would be appreciated.

Also, I can't find any information as to what fuel I am supposed to use. Is it leaded or unleaded.

Thanks for your help.