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Indexing plugs can help with some combustion chamber designs, but the gain is miniscule at best. HOWEVER, that method of just tightening until it points in the right direction IS ABSOLUTELY WRONG. Sparkplugs have a torque specification. Tighten the plug to that specification and if it points in the wrong direction, get some indexing spacers.
Insulating fuel lines used to be pretty important, especially with older carburated engines that have been modified with headers or rerouted fuel lines. It's not much of an issue these days, but if you do have a fuel line that's close to a heat source, you can buy insulation that's make specifically for that. Check Summitt or Jegs catalogs.
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Don
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