First a 355 even with Dished Pistons and 76cc Heads has more then 8.2.1 C/R . Next the L-82 350s 1973-80 had 9.1 C/R and a Bigger Camshaft then the 327-350 HP #151 Camshaft . They also had 2.02 / 1.60 Valves . The L-82s I had Ran very Strong right out the Box I have built SB Chevys with 8.75.1 that ran 13-Teens with auto trans 3.42 Gears . I know the cam that works real good with the Lower C/R SB Chevys COOL