You know you need different exhaust manifolds , right?
And a hard lesson learned... have the block totally stripped and sent out to be tank hot-dipped in chemical cleaner and flushed.
Then have it "magna-fluxed" to check for cracks.
I am rebuilding a "zero-time" rebuilt wartime engine with only 50 miles on it because the shop didn't tank-dip and solvent clean the block. They power washed it with kerosene and used hih pressure air to blow it out.
Running it has loosened up missed sludge that shifted and blocked a piston bearing oil port and totally trashed a piston bearing. In the rebuild process now.
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