The block may be the same not sure but other than that they're completly different

 

Look at his username, "DuramaxBen" he's a chevy guy...

PSD
17.5:1 compression
HEUI injection
Direct injection
Computerized

IDI
21.5:1 compression
In Direct Injection
Uses stanadyne DB2 Injection Pump
Non-computerized
Just like old tractors

 

Blocks are different too. Big difference.

 

To answer your question, "What is the pop off pressure for fuel injectors of the 7.3 Liter IDI? Pressure is usually set at between 1850 psi for Delphi injectors and can range up to 2000 psi for those that like a hotter injector.

So yes you should be able to use your equipment.

 

I love when somebody asks for help....then tells the people who help they are wrong.

Carry on...