Hello folks, building a 396" W2 headed. Engine will run 12:1 CR on Alcohol, 904 w/ brake, 4000rpm stall, 4.88 gears, 3400lbs car. W2 head flows aroung 300cfm and I have 2 options of flat tapped camshafts. Crower 276/281 @.050 108 LS and Lunati 259/267 @0.50. Which one would you choose and why?