Hey, there's a forum on this site for Brand X - learn it, know it, live it!
Anyhoo . . . I can't help you here as I've never really kept up with this stuff, but this one stands out:
"t was also my understanding the cam and heads for the base engine with a four speed were the same as the RA III setup."
I don't think that's true. I do know that Pontiac people have been confused with this issue too.