Bill- I have many intakes and valve covers, but have never seen a Edmunds valve cover before until you posted pics of yours. I hope you don't mind that I "borrowed" one of your engine pics to use as my background on my confuser screen for awhile. I really like that Edmunds cover! If you would consider selling your spare valve cover, please email me. I don't have an Edmunds side cover to trade, and have never seen one. I do have 3 or 4 different variations of Edmunds intakes though.
I believe the Edmunds air cleaners are cast by Dennis at O'Brien Truckers in Charlton, MA. and Charlie Price and others resell them. Some of the linkage pieces that Charlie sells come from Marty at Northwest Speed in Portland. As far as I know, Vintage Speed makes nothing, but does assemble some nice looking multi-carb. setups if you can get Charlie to get them done and send them.
Yes, the Stovebolt Engine Co. side covers were sold by the original owner (Ron I think it was?)of the Stovebolt Engine Co. when it was in Washington or Oregon. Up until last week I had some of their old catalogs from the late '80's that showed that same side cover, but I pitched the catalogs in the great "office" clean up of 2005. Wife declared that the floor could no longer be used as a filing cabinet. I figured as long as I knew what was in each pile, floor and filing cabinet were one and the same. Oh well.