[Karl Bebout]

Thanks Danr: didit, didit, didit. A 25# radiator cap stopped the puking, but getting up to 230*-240* at 80MPH is still 'way too hot. Jacked the timing every which way, same for jetting. Thinking I've got a lean issue on some cylinders but not all served by the same plane from my dual plane air gap manifold. Still searching.
Mikiec, checked the head gaskets and they can go on only one way, otherwise the bolt holes don't line up.