I modified my gas core to accomodate the diesel radiator... probably not text book correct, but have done it twice now, one truck I drove, the other I parted prior to driving, and on the driver I never had any issues.
First IDI was an 86 f 2fiddy, that looked like a pinata, right at the split second moment when the pinata defecates candy, had a pristine "bricknose" Bronc, F2fiddy then wore a Bronc clip and doors.