The issue is with the hood, not the fan shroud. As OG68 says, the 68 hood has a full brace where the 69/70 hoods look almost the same but that brace area is angled away to clear the plastic rad shroud on the 69/70.
The reproduction hoods sold as "68-70" are actually correct only for 68...the fix is to cut out the brace from a 69/70 hood and graft into the repro hood.
To install a 68 rad shroud plate may require a 68 rad and I think you would also have to cut the top lip off your rad support to make it fit.
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Michael
Oshawa built 1 option Judge basket case. 463, SD KRE 295's, CNC'd factory intake, Cliff's Qjet, Stump Puller HR cam, RARE RA manifolds, Pypes exhaust, T56 Magnum, McLeod RXT clutch, 3.42 12 bolt. 24 year project almost done... 
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