Yep, you've got the good round top SU carbs. The header is aftermarket, definitely not a stock cast iron (or is it cast steel?, can't remember) exhaust manifold. You do have the '73 style intake manifolds and thin carb spacers. It appears that the balance tube is an earlier piece too, without so many emissions provisions, but like you said, it appears that all of the emissions equipment has been removed and all of the extra ports capped or plugged.