Just a 7.3 users info. Might help, might not. I run a .04 in the horn for the WOT (electronic ZEX) 1st stage. I also have a mechanical switch to start the set of 3 timers that activate stage 2,3 and 4. The 2nd and 3rd stage are pre IC and post IC right at the inlet/outlets. to give a softer hit on the 2nd stage (pre IC). The 4th is on the horn to deliver before the 1/8 mile and uses a .125 solenoid and all the others are only .073 max flow based on the opening. This allows me to jet a smooth continuous pull all the way down the track and not a hard hit off the line with a single or dual stage.
This is an excel I put together for multiple jets. Just add the jet size for the stage (zero if you don't have all the stages) and the actual single size will be displayed at the bottom.
Multi Jet Calculator Hope this helps!
*nx*