My 422 smallblock build
Leaving it straight up will reduce your dynamic CR. If you're right on the limit for pump gas, that might be the right call.
I'm actually considering doing exactly the same thing on my build, installing it straight up instead of advanced 4deg like the card says, for exactly that reason. Bumping around 10.9 with an .027 cometic and the Pistons .010 in the hole.