I wouldn’t cut the center divider. Bad move. Not on that intake unless your in full race mode. It’s a good trick with big cams. AKA .600 lift.
That intake is a copy of the OE intake. It is very good from idle to 5500, no problem. It should be excellent on your written build up. You can use a stock carb or whatever you want to top it with. I’m not 100% sure, but you may need a spacer with a Holley on top. IIRC, which is the problem, the throttle linkage arm has clearance issues with that OE/MP intake.
A Carter or Edelbrock is a bolt on and go.