I would guess the lump ports would help it smog out better, because they get rid of the dead zone and disrupted flow thru the intake port. That is just a guess.
As far as the cam, I have not smogged a six in a while but on my 400 v8 Ford (about same cid/cyl as a 292 six), with no cats, only an air pump for smog, I ran a 204-214-112 cam and it smogged out super clean, would have passed mid-1990s smog standards. So if you have cats, I bet you could run as much cam as you wanted for a mild build and it would still pass. Unless you're running headers, there is a 194-204-112 cam out there which is about as big as I'd go for an everyday 250 build, maybe even a step bigger would still pass smog given the cats.
I was considering Ford Windsor valves for my 250 build, they are 1.84 x 1.54, has anyone ever done this?
