Ron:
Gates Barrier and Parker Abrasion King Push-on (there are others; but, those are the two I like) are more or less conventional reinforced rubber hosing that are rated for use on fuel systems up to the 3 Bar fuel pressures used on most port injection systems. The Gates and Parker hoses are stiffer and thicker wall than fuel line for carb systems; but, you can clamp them with a correct flat surface clamp with no damage (the reinforcements are 'fabric' of some ilk).
The K jet system ran fuel pressures of around 100 psi so those fuel lines are a cat with different color stripes as are new engines using direct injection - the no clamping rule would apply to those cases.
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