I put the UD/Lunati "LS-6/L-78 replacement cam" in my L-78 clone (I don't know the Lunati # offhand). It replaced a repro stock L-78 cam (same exact specs). The UD/Lunati is a solid lifter, 238/238 deg duration @ .050 lift vs 242/242 for stock. UD/L is .550/.550 lift vs .520/.520 stock. UD/L 112 deg LSA vs 114 stock. The UD/L idles and sounds just like the stock one did but has much more low end torque and feels noticably stronger throughout the rpm range. Has plenty of vacuum for power brakes, a little more than stock. Stock type GM valve springs worked well but one caution: Be sure to check stock rocker arm slot clearance. I had interference on some exh rockers and had to lengthen the slots by grinding.