I'd go with a Voodoo 703 or Ultradyne that is close.
http://forums.maxperformanceinc.com/...d.php?t=817331
https://www.lunatipower.com/voodoo-h...8-268-276.html
Advertised Duration (Int/Exh): 268/276
Duration @ .050 (Int/Exh): 227/233
Gross Valve Lift (Int/Exh): .489/.504
LSA/ICL: 110/106