Scott you are in luck.
A pair of the RoundPort LongBranch exhaust manifolds available on eBay.
Hentooth/Froghair merchandise.
How badazz would that be to have a 69 Fullsize with factory RoundPort set up.
and less than a million - only $1800 USD
https://www.ebay.com/itm/1968-69-RAI...8AAOSwyR1d6usB