LOL I'm drowndening in injection

Holley's own (damn poor) site suggested it was 15 psi. This was their online catalog, what a POS.

https://www.holley.com/12-927.asp

Summit says 43 gph, 15 psi

http://www.summitracing.com/parts/HLY-12-927/

15 PSI is what the TBI runs at idle but its not enough head pressure to allow it to rev up