The old duster is a 73 318 car that is factory A/C, factory cruise control. The body is a bit rough, but it has character. I have no idea if the engine is original but it's still a 318 and runs very well for what it is. The only changes are a Holley Street Dominator and Carter AFB. It doesn't even have headers. Yet. There is also a 340 on the stand out there for it. I just need to nut up and bolt on the rockers and intake and put it on the run in stand and then get it in.
Not sure of the rear axle ratio but I suspect 3.08's.