Mal,
I remember Indy saying i would need more rpm,maybe towards 6700. Seems most agree short runner equals higher rpm,plus volume too big equals low rpm performance loss. Thats why mine is off,be fine on 500ci
I filled my intake with water,just over 5 litres

Tex

New best ET 10.259@129.65 .
New best MPH 130.32
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive