Intake questions for 12a bp...

[TheDriver216]

I have a side draft manifold i was going to have drilled for injector bungs and have a plenum fabbed up to bolt to it. My question is will 2 injectors work fora bridge.. when making the plenum what size/ how much volume should it hold? and what would be a good throttle body to use? i was thinking of a single mustang throttle body or a LSx truck throttle body? Will it allow enough flow for a NA engine? Any insight would be greatly appreciated.