My dad is freshening up his 408 after the block cracked a cylinder. Curious if a cam swap would help or not. Car is 3250ish with driver, 408, 727, 5000 stall convertor, Dana 60 4.56 gears, 30" Tire. Shifts the engine at 6000 cross 1/4 mile stripe around 6400. Car has been low 10.80s. The...