Questions Regarding 383 Barracuda Engine Compartment

If you decide you want A/C be advised that the '73 up cars had a different firewall for the A/C cars, versus non. So when retrofitting a 73 Up system, you will need the matching firewall or a major piece of it, and the 73-up A/C heater box with it's control panel, to operate the vacuum system.

Also, the 383 IIRC has a short stroke of 3.375 , and a large bore around 4.25 . This engine will NOT be fuel-thrifty. But lordy will it hammer the driveshaft, with a manual trans!
and btw, the 3.75inch 440 crank can be made to fit, lol.