<https://howellefi.com/product/tbi-kit-twin-tbi-kit-for-big-blocks/#product>
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"Part #HT2X4BB &amp; #HT2X4BBD\r\n\r\nFor converting any oval port Chev 396-502 engine from carburetor to twin throttle body fuel injection. Two remanufactured TBI units, sold with a new Edelbrock 2x4 intake manifold made specifically for oval port big block Chevrolet engines. Option with ignition control includes a new electronic distributor, coil, and knock sensor. System uses a remote, bypass type fuel pressure regulator, and precision progressive throttle linkage for improved driveability. Kit includes wiring harness, GM ECM, all required sensors, and an in-line high pressure fuel pump. Components can be ordered separately for use on any GM, Ford or Chrysler engine with 2x4 intake manifold designed for Carter AFB or Edelbrock carburetors to convert to EFI."
<https://howellefi.com/product/tbi-kit-twin-tbi-kit-for-big-blocks/>