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Old 12-20-2012, 10:29 PM
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.. 600 Carb.s usually come default setup for a 302"/305" or base level 350", hard to adjust to a GTO engine... the 750 should have been pretty good out of the box, though, but a little lean...

.. Same problem with two known good carb.s kinda points to fuel pump and/or ignition advance problems... can you check the fuel level in that Eddy carb.? I know you can easily on the Holley 750...

.. Don't just check idle ignition timing, rev the engine up slowly and watch what the timing advance does... it may go to 50 degrees BTDC or more under no load/ light load cruising with vacuum advance hooked up, but hopefully only up to about 36-38 degrees under load or with ported vacuum disconnected... if points ignition, dwell has to be correct... Centrifugal advance weights under rotor can rust/freeze up and not move, bushing/bearing in weights can wear out and let weights flop around, bushing can be too tight fit in a brand new distributor preventing weight movement. The weight springs can break.

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