They were on my 360 when I bought the car.Those are 273/318 manifolds.
Well, I don’t know about that, I’m just putting it out there in case somebody wants them. No issues with the car, took it to HP Engines and had it stroked and got these back from Hollis.Sure, they bolt on just fine, they just don't flow as well as the 340/360 manifolds due to the smaller port size. They tend to blow gaskets too because of that.