Viper ,
mine is 272/272@050 , .600 nett lift
With cnc stealth heads , Victor 440 and a Prosystem HP1000 i modded , i went 10.50s shifting @ 6000 .Tried 4500 + Super Victor for no big gain maybe a little more consistant. The TF270 with Super Victor/4500 made the converter stall rise 200rpm which is why i am running a little more rpm ,plus the extra block weight . This is through street exhaust . never have run it open .

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