i had the t-25 from an sr, 370cc sr injectors, and just 5-7 psi. BUT the engine had close to 250K on it also. for me, it was a rebuild issue. i was also using the emanage blue system.
it’s easy to turbo, only thing i had a bitch of a time with, was the oil feed and coolant lines. the threading didn’t match anything else i had used. other than that though, easy as pie.