Brian can set you up with some RHS Magnum Heads that will hep you get that 7 sec 1/8 mile. He Has a stroker he did for a magazine that did 7 off the trailer.
Ebay has some for like 120..I have them and love them http://www.ebay.com/itm/383-440-Fabricated-Valve-Covers-Sheetmetal-Polished-/170597726894?pt=Motors_Car_Truck_Parts_Accessories&hash=item27b86abaae&vxp=mtr