Carb recommendation 408 stroker
Hi, so you are near Dornbirn? Maybe you know the Seppi Guys...i run ProET with them. Think they are from there.
Regarding the fuel: Mbaird is right, our octane numbers are not the same as in U.S. I suggest to check the compression calculation again.
Regarding the springs: if the comp springs have the same dimensions, i´d trust them more than the springs supplied with the heads.....
Michael