If this is a car that is going to be driven a lot of miles then I would stick with the same size tire all around just so you can rotate them, both my Gbody's have different size front and rear tires but only my Regal has the same rim size all around but I still went with a 275/50 and 235/50 on 17 x 8.5" rims because I feel it gives it a more aggressive look and obviously more grip in the rear.
245/60's will fit fine in all 4 corners, I have them on my 88 Super Sport with 15 X 8 corvette rallys but originally had them on the N95's
My younger brother has them on his 85 SS with the steel rally wheel and it fills the wheelhouse better than the 215/65 did.
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