La 318 mount don't fit 5.9 magnum.

crackedback said

You are flat out WRONG!!!

That bracket is what he needs to put a 340-360 in a 67-72 k frames A body. I've been doing them for many years.

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73 to 76 360 uses a different mount. Parts house I worked at has two different part numbers!!!! And crackedback you will notice I said 74 360 which is the newer style not the biscuit style you are referring to.