rebuilding a slant 6

I did mine .030 over silv o lites, .020 off the block, .080 off the head w/ 1.70/1.44, iron 2 brl intake with holley 350 2brl , mp.460 lift w/268*dur cam, cross drilled std crank w/2.76 gears it got about 23mpg and around 20 mpg w/3.55