If you dont care about gas then get 4.56's!
There was a NA 4V shootout in MM&FF a while back and almost all of them had 4.56's, there were guys with common bolt ons and those gears passing into the 11 second zone. The winner was Al of Boss330 Racing with his 5.5L stroker, but we all cant afford a Ford GT 5.4L aluminum block

He could have gone deep into the 9 second zone on slicks. He only got 1 pass in because of a mysterious ticking in the valvetrain. The runners up were running stock bottom ends with ported heads, FR500 .472" lift cams and bolt ons and a couple were in the 10's with 4.56 gears.