Smallblock efficiency or How to have your cake and eat it too

My recipe
360 magnum block with Quality machining ie line hone, torque plate hone, square decked
surface polished, knife edged, stroke equalized, and indexed factory crank with no hole balance job with bearing clearance on the tight side
windage screen and crank scraper coated bearings Milodon 7" pan
0 deck flat tops with 1.5mm or .043 rings thermal coated top and coated skirts
EQ heads 2.02 / 1.625 valves ported to 250ish cfm
hyd roller utilizing the factory roller lifter gear and 1.6 roller rockers
single pattern cam in the 230° @.050 range ground on a 112-114 +2° or 4° with as much lift as I can get
RPM Air Gap intake with 750 vacuum secondary Holley or dare I say it factory iron intake with Qjet and utilize the EGR system
properly curved vacuum advance distributor
TTI headers with 3" exhaust

I don't think it would pull down 500 HP more like 430-450, but it would turn in fantastic mileage when tuned right
id be interested on some mileage #'s when you can test it.