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like Mr Pete said you will have issues with the push rod tubes but it can be corrected, you can mill cut the pocket deeper with a 1-3/16" bit about 100 thousands and it will accept the 69 push rod tubes and "O" rings.
There are some other differences in the intake area, the intake manifolds are smaller in diameter and so are the intake tunnels, the good news is it probably makes more torque from this.
There are some other differences in the intake area, the intake manifolds are smaller in diameter and so are the intake tunnels, the good news is it probably makes more torque from this.