318 build with XE268 AND 302 heads

I think The reason for the adjustable valvetrain is comp made their base circle smaller. They changed the suffix in (at least) their hyd flt tappets. When I called to ask why I couldn't get a certain part # that's what they told me. So now, not only do they grind them all on a 110 Sep angle, they all have the same base circle. Generic saves money!