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348/409 distributors are longer than other Chevy V-8 units. From left: Original high-perfs had a Delco dual-point with two-window cap. CH's spacer-sleeve lets modern Chevy V-8 distributors fit-including a GM HEI or (shown) MSD billet. You can convert old 409 single-points distributors to breakerless with available aftermarket kits.