Close? as in how close? Maybe new radiator inlet/outlets are in different locations than stock. There is no law against lowering radiator.
From the web:
If it's a 230 or 250-6 with 3-speed manual, the frame mounts, motor mounts, bellhousing, flywheel, clutch, pressure plate, release bearing, and starter will all swap from the 6 over to the V8.
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