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I've replaced throttle body efi with Holley 4bbls before, finding more power and throttle response in the process. You have a 462cid big block, it will never sip gas even with a really good b.s.f.c. but you should be able to get 10 -12 mpg on the highway if you have overdrive. That motor sounds like it would like an 850 double pumper more that a 750 vac sec.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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