That's funny, I thought it was the 94-95 blocks that are the anchors.....
With a little help, my 96 NPI's aren't doing to bad...
But, I digress... this is a good question, maybe a more specific title like "'96 - 98 Heads -- flow numbers please?" might elicit some response... I know that someone out there knows the answer, or knows someone that does....
'96 T-Bird LX 4.6L Alive & well & living in S. Florida
N/A: Renegade NPI heads/Comp Cams; OEM intake manifold; Bolt-ons
245 rwhp; 13.713 @ 99.35 (Commerce, GA - November 2003)
BLOWN: Renegade NPI heads; Renegade shortblock; Intercooled T-Trim; some other stuff
Pump Gas Numbers - 547 rwhp / 525 ft.lbs; Best Time - 11.388 @ 118.68 (Commerce, GA - November 2007)