340 intake on a 273???

I could SWEAR (this was 1976 or so) that I once tried to fit a 340/360 intake to a 273 and the ports would have leaked. Maybe using 273/318 gaskets would have worked. In other words the 360/340 intake ports were too big in the valley area

Yeh. I'm old, and I might'ha forgot. But I ain't senile YET