Lineslinger Mark you make your own decessions. Go with the bigger is not always better aproach. I am doing the same thing with motor#2 as far as bore and stroke. I have run it on dynoslim and dyno 2000. I am happy with the numbers. Dependable and low maintance is the fun of owning a cobra. I have done the 5 nights a week and all weekend wrenching racecars and have grown tired. You have the makens for a real nice 452-454 FE motor. I would think about changing the crank for BBC rods because of the bearing width. Scat sells a crank for this. Keep the motor under 6500rpm and long live the COBRA
Rick Lake Ps a cam under .600" also. get the cam to match the heads and intake system.