Re: carburetor jets
Stock, other than headers, I always ran #73 primaries and #76 secondaries with the stock power valves in our 4346 carb on our L78 and L72 engines. Our 427 came from the factory with #68 primary jets and there was definite lean surge and 60 mph. They worked fine with this setup. If nothing else, it is a good starting point for fine tuning. The engines ran/run clean with long plug life. Sort of duplicating what Eric said, but the combination does work.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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