59 degree with edelbrock mag. heads, well heard from the shop crower won't swap the t bar so back to either shaving the t bar and the flat slide but for clearance or they are contacting Ritter to just ask about clearancing the block a bit more.
Maybe your machinist can simply sonic check the areas that need clearancing. Even if Ritter says it's beefier there, I would not risk blindly grinding there, in case of casting differences.
