Not a B-Body, but I ran -6 Earls braided line and fittings through from the tank to the engine. You can get bulkhead connectors also instead of diving underneath chassis members.....looks ugly and lazy when guys dive under a cross beam or the like. Lots of fittings.....be prepared for a lot of cleaning - always blow your lines out once fittings are attached, and even pass fuel through to clear out before connecting to the engine.
If you feel like splashing out - I picked up this cool tool set (Koul Tools Part #468) which will make attaching the fittings to the braided line easier than falling off a bike.
Some pics of my lines, and the tool set.... (I bought this set after doing the lines - would have saved about two days if I had it earlier)
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The last picture shows the upgrade to the upgrade ....I changed from suction to an in-tank under solid advice from several people. Now running a Holley in-tank pump, it is much quieter and there is little chance of cavitation or air-locks. The earlier picture shows the tank drawing fuel from a small reservoir I had built in to the custom-built tank. The extra return fittings have been capped off now.....I made sure I had options from the start.
Chassis connectors come in different lengths.... I think up to 4 inches.....mine are 3 inch.
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Here is the inventor of the tools giving a demonstration of how they work....