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I would run the feed/y-block near the firewall, above the bellhousing, but again, not a fan of on the firewall itself.The return, maybe run it like the OEM feed line. Up through near the alternator/mechanical fuel pump boss.
You can make some bracket on the rear intake manifold rail hold down bolts to hold the y-block.Here's a y-block -6 AN that's mountable:I know Stage V intakes do not have holes drilled for their intakes in the rear, but you can add a couple. Just got to line them up perfectly w/the holes in the block.For the front for the regulator, another bracket off the coil mount boss.