I'd think that you could do all of the fixes that are applicable to the GTO Enduras. There are parts out there in good shape if you do some looking. I wouldn't let the cracks in the beak scare you away from a car that you like.
On a side note... start clearing room in the garage now if you're gonna bring it home. The Bonneville is muuuucchhhh llllloooooooonnnnngggggger and wwwiiiiiiiiiddddder than an A-body!
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1966 GTO
1969 Lemans Convertible- F.A.S.T. legal family cruiser. 12.59 on G70-14 Polyglas tires. 1.78 60'
1969 Bonneville Safari- cross country family cruiser. .
1979 Trans Am 400, 4-speed, 4 wheel disc.
View from the drivers seat racing down Atco Raceway-
http://www.youtube.com/watch?v=GhYDMdOEC7A
Ride along in the other lane-
http://www.youtube.com/watch?v=mIzgpLtF_uw