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I would have said a 4-pin module HEI distributor, and a carburetor + adapter plate or carb'd intake manifold. A set of pulleys and a belt to run the water pump plus a radiator and hoses if you're gonna run it more than a few seconds.
I use my engine assembly stand, and a radiator cart with various switches and gauges, a battery, a fuel tank, etc. to test-run engines. Use a '67 Dodge Dart 225 exhaust system, modified to fit V-8 exhaust manifolds. Supporting the front of the engine with an engine hoist is helpful, otherwise the engine does jiggle on the assembly stand. Any sudden change in RPM--increase or decrease--results in a tendency for the engine to twist on the stand. So a calm hand on the throttle is warranted.
Father-In-Law's Pontiac 455 and my run-stand set-up:
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This of course works fine on any engine where the starter motor bolts to the block, and has provisions for an engine-driven fuel pump. Doesn't work for crap on Fords and Mopars where the starter bolts to the bellhousing. You'd need a separate fuel pump for any injected application, or for engines that don't have an engine-driven pump.