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Last year for a 302 carb was 1985 or 86 for trucks. Best mpg? That's a 64 million dollar question. My pick would be a Holley 350 cfm for a 2 bbl, for a 4 bbl a Holley 390 cfm.
Although 1985 was the last year for a carburetor for the 5.0, I wouldn't call them simple.
From 1984 - 1985, the 5.0/302 had a feedback carburetor. Like electronic fuel injection, these models used an engine computer to control all emissions, ignition timing, and the air/fuel mixture via the feedback carburetor. So these models are somewhat complicated compared to the earlier models prior to 1984.
Some California models used a more primitive form of electronic engine control as far back as 1980, so watch out for those as well.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.