I just came to read and find out that the 273 pistons are a bit of a challenge. Or has been. Maybe rather pricey, but I see Egge has them for both the 2 barrel and 4 barrel version. At least possible to get. I assume other parts are more similar to the 318 and easier to find.
Bill
Oh, well, I guess $449 a piston might not be considered an option even.
Maybe I understood that wrong, that it is per.set of 8 pistons and not per piston.