6 Cylinder Valve Cover

[Ironhorse]

Can someone with more knowledge than I have (which would be just about anyone, LOL) help identify what inline engine this valve cover fits? Have spent a fair amount of time looking and searching but not finding any pics with the twist lock oil cap centered as it is with the Chevrolet script logo stamping. Has four mount holes, two each side, no wire routing tabs. Was really nasty, dirty and oily but after a good scrub in a solvent bath, bead blast, prime and paint looks so much better. No dings or dents, nice flat mounting edges. Still had a cork valve cover seal on it when I got it. Will offer it up for sale to the correct parts forum when I find out what it fits. Am thinking possibly early 60's Chevrolet, no provision for PCV. Also would like some input for a value. Thanks