Brock,
I too have a f-28 intake with 2-4's [500 cfm's] It is on a 289, 1.9 intake, 1.6 exhaust. Ported heads, roller Hyd. cam and roller rockers. I also installed an AOD.
I get about the same milage you get, but I haven't checked it since I took the c-4 out and installed the AOD. Around town is still about the same, single digits.
Nice Ride
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