hmm...
interesting.
I have read back and forth, and really had been unclear on this one, but recently thought I had it cleared up when I was reading an article of a one owner (unrestored) 1968 Firebird 400HO - and it showed regular manifolds.
I had thought that a one owner unrestored car was hard to refute;
/\ /\ I had thought I was seeing the standard manifolds here?
I guess I am seeing the long branch manifolds and mistaking them for standard manifolds?
If this is so, then the only difference between a (mid)1969 RAIII & 1968 400HO would be the induction(!?)