Yes my early Clifford has bolt bosses for the long bolts to the exhaust manifold. I think I had to drill the short hole up from the bottom. There was a flat pad on the bottom of the Clifford meant to mate up to the iron exhaust opening. As I said I milled it more, 1st cuz it didn't line up / not flat, but also to leave a gap for a steel plate to keep the exhaust gas and heat off the aluminum.

I also had to drill out the vacuum holes although the bosses were there. No provision for heat. If I needed heat my plan was to use a Ford carb spacer that runs water thru it, though that would be tight with the tall 292. Cant complain though, I got the Clifford for $40 circa 1994. Even with 2% inflation that's only $200 or so today, LOL.

Cant wait to try headers on the setup but life intervenes.