Holley #3247 / 3886101. Original Holley #3247 manufactured in 1969 ( 983 ) to original specs. Slotted screws, correct fuel blocks #4501 pri & #4519 sec As used for 1966 Corvette L72 427 425 / 450HP engines. Rebuilt, tested and run on engine. $600.00 plus shipping. Available at NCRS Texas Regional, Frisco, Tx. Oct 23-25. Call / email info.