I came across this list of various tbi engines:

GEN 1
TBI 4.3 160hp@4000 235lb/ft torque@2400rpm
TBI 305 170-180hp@4400rpm 260 lb/ft torque@2400rpm
TBI 350 200-210hp@4000rpm 290-300 lb/ft torque@2400rpm
TBI 454
low po 230hp@rpm 385 lb/ft torque@1800rpm
hi po 255hp@4000rpm 405 lb/ft torque@2400rpm

I have a '95 k2500 suburban with the 454. It was mentioned that the low-po was 90-93 and that the 94-95 was the hi-po version.

TBI L19 454 230 hp @ 3600 385 lb/ft torque @ 1600 rpm
3/4 and 1 ton as well as 1990 454SS 80 lb/hr injectors (9-13 psi low pressure fuel system)

TBI 454 255hp @ 4000rpm 405 lb/ft torque @ 2400 rpm
454SS(91-93) and 94-95 3/4 and 1 ton trucks used 90 lb/hr injectors at 28-32 psi (high pressure system)
Is there a RPO code that'll tell me the difference or is it only decipherable via measuring the fuel pressure?