Sure, there's mags for the str8. I don't think that I've seen any on Ebay or such, but I'd guess that vertex or scintilla could make one up. As 39cent says that they all made 'em, probably still can! Trouble is, while a mag certainly looks cool, moderen electronic CD type ignitions work better.
Now, the hudson vs buick, I have to agree with 39cent, Hudson. Why? Hudson was very serious about their cars being fast, and hence, the engines. A really good breathing flat head is better than a bad ohv engine in spite of the seeming advantage of ohv. The buick with a well prepped head and the duals? Well now, that may be intresting! alleycat