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1. The 383 Chargers did not come equipped with fuel vapor separators or return lines as this was a high performance addition to cars equipped with 440 and 426 engines. My question is do you think it's a good idea to use these setups on 383 cars too? Do they make a big difference in preventing vapor locks? I'm in the middle of a restoration and the engine was rebuilt to a little more than stock 383 hi-pro specs, maybe 400 hp with a 4 speed.

2. I got a bunch of s-clamps in a fuel line hardware kit from megaparts. Are these used for attaching the return line to the main fuel line? BTW, I called megaparts with this question but the woman I talked to didn't know. She did tell me the kit I got from them was the last one they had in stock at the time so it was a bit of a mish-mash collection of leftovers.

3. Is there more than one p-clamp used on the main fuel line besides the one that gets bolted to the shock mount cross member? The megaparts kit I got also contained three p-clamps and two p-clamp mounting bolts (one extra p-clamp was provided accidentally). I'm assuming that the kit is a catch-all designed for use on R/T and non-R/T Chargers so my guess is that the second p-clamp is for the return line, no?

4. How can you tell if you've got a decent sending unit? When I first bought my 68 my plans were to make her a driver so I bought a fuel tank and a Spectra Premium Industries sending unit off Ebay and it's been sitting in its box ever since.

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S clips are to keep the lines from rattling, you
still use clamps(in your case a 2 line clamp)that
attaches it to the frame... on the sending unit...
its 0 - 1800 ohm full to empty