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If you have a classic car, you shouldn't have to pay a ton of money for *custom fit* spark plug wires, when you can buy a generic set, and cut them to fit your engine perfectly. A good cut to fit spark plug wire will terminate easily, be beefy enough to survive a muscle car's engine bay, and give years of trouble free service.
Make sure when routing your custom spark plug wires that you keep them at least an inch away from hot exhaust and engine parts. If things are real tight around the cylinder head consider investing in some heat sheild sheathing for the 6 inches of spark plug wire nearest the spark plugs.