Another intake, very similar to LD4B, but with large port exit. I seriously doubt you'd know the difference by seat of the pants driving on the port mismatch.
DODGE 5.2L/318 Mopar small block LA Weiand Stealth Intake Manifolds As nm9stheham stated, at the 5000 feet of elevation, the 500 CFM AVS II will be the carb you'll be the happiest with for cruising. The 570 Holley street avenger is another good candidate. The words that stand out most in your description are "cruiser with good throttle response and driveability with moderate performance" and "not a race car". Stay small and be happy, CFM ratings are overrated anyway. It's fairly well documented by people that have to make 700 hp or more with a 390 cfm Holley four barrel (along with a plate with four 11/16 inch holes mounted one inch beneath it!) that if the carb is undersized, the extra vacuum signal generated by the engine goes past the vacuum level that the carb is rated at and the carb flows more air at that point.
