Holley/Demon Carb stumble

Yeah im continuing on with this package but it far from a matched package. The Demon metering block is the odd man out at this point, and need to buy some metering block that work with a Proform main and base. And i think i'm going too.
The problem is i can buy a standard set of primary 3310s........(gamble with porosity)Or a billet blocks that i can put a 3310 tune into??????