You can buy AN adapter fittings for the fuel rail block. I've done it and used these SS braided/ AN fittings:
Fitting, Straight, AN Flare to Metric, Aluminum, -6 AN to 16mm x 1.5 Male
Fitting, Straight, AN Flare to Metric, Aluminum, -6 AN to 14mm x 1.5 O-Ring
Adapter Fitting; Power Steering Adapter; Anodized; -6 AN Male To 5/8 in.-18 O-Ring Seal ( believe this fits the gas filter)
Don't quote me on the above but these are commonly used for fuel injection SS hose AN connections
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "