Spool Mount ?????????????’s

My buddy bought a 73 Duster rolling shell. It was a 318/auto car. The engine mounts on the k frame are comepletely different from the ones in my 68 dart. The car has the sbp wheels front and rear. The rear appears to be an 7 1/4. What do I need as far as mounts go to install a 340 in it???
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