[garry viohl]

I have a 428 fe with 428cid
425 hp 475 tq
800 cfm holley double pumper
msd mechanical advance
edelbrock rpm heads, cam, intake
plugs look great, not rich
getting 5-6 in town, 8-9 hwy

Does this sound right?
Anything to improve this without killing performance?
I knew this thing wasnt a prius.