(Newbe) 273 to a 340 and tremec 5speed swap.

67 Dart "Charger" 273 HiPo exhaust.

https://www.accurateltd.com/1965-67-273-Hi-po-System-for-Barracuda-Dart_c_69.html
https://waldronexhaust.com/product/...uda-v8-273ci-4-bbl-carburetor-single-exhaust/