If you change metering blocks, use Quick Fuel parts - my experience using both brands is that QF is way better even though they look identical except for the color of the anodizing. QF sells good parts.
Every project is going to be different. The best way to jet your carbs would be to use a wide band O2 sensor and some software, like Innovate sells. When I did my tunnel ram project on the 302, i had to jet the 600 CFM (#1406) Edelbrock carbs up 4% primary and secondary on both units. "Conventional wisdom" said that's too much carb on a 302, gonna be way too fat. No so in real life. But - always start at the factory settings on everything. If your build is close to stock or a bit more, that will be close from the get-go. Holley jets are usually 3% change but the tolerance in the regular jets is such that you might get 3 or a bit more than zero, so normally we change 2 sizes in any direction. IF needed - build it and road test, then go from there.