Slow, Driving Rustoration 1972 Dart

These are what I bought:

Driver Left Exhaust Manifold 8-360 Fits 1965-67 73-74 FORD F100 PICKUP 521977 | eBay No idea why the preview link shows ford. It was listed as Dodge truck but the inventory tag says 1973 Fury 360

Dodge Plymouth 1972-3 340 Drivers side Exhaust Manifold. 3617-368 | eBay