The Perkins manual says 11.0 to 13.5 psi, obviously at full power. They give only one pressure, even though that same engine has three different ratings, 250, 220 and 185 BHP.
I'm curious what you get, and what exhaust gas temperature you see at full power.
John R. Stewart
"Rise 'n Shine" Prairie-29, (formerly) "Driftless" Albin-25, Hull number 737
Dighton, Massachusetts, USA