Don't use the heads. One side will have high comp. the other will be lower. This will really upset the motor, as you will have timing/fuel delivery issues that can never be worked out cause of the comp. ratio differences.
You'd be better off finding some E7TE heads. That's too bad about the heads because they would have worked good if the 73 matched the 70. BTW I can't even find a listing for the D3UE head. Nothing I have even has a 3U digits. I'd be curious as to what that head is.
Good Luck.
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