1968 Match Race '383 Road Runner' vs 'Cutlass 350 Ram-Rod'

My dad had a 68 442 400 4 speed and with tires it ran mid to high 13s. Thats because it was always busting up at higher rpm.When he changed the carb to a holley and added stiffer valve springs the busting up quit.Ran 13.10s thru headers and cherry bombs.