I have 416ci L86 with LT4 HPFP and injectors and LT4 camshaft , I have tune the injectors with LT4 table but the issue is there are drop in HPFP pressure between 3000 to 5000 RPM only and Injector DC are increase in that portion
pump got replaced with same issue
Low side fuel pump are upgraded and no issue ( not less than 60psi)
file and log are attached
RMT 3.0.hptdrop 4000-5000.hpl