Your project will soon become much more expensive than you anticipated. A nice car you can drive is better than a dream car unfinished in the garage.
GTO suspensions were pretty much the same basic architecture 64 through 72. If it was mine I'd do the same thing I've done twice before. Refurbish all the stock control arms front and rear, tie rods cross link etc. Install a Trans Am front sway bar, used, 1 1/4" diameter and any old A body rear bar and boxed rear control arms.
A good welder can box your old arms and install a brace to prevent crushing where the rear bar attaches. (you'll have to drill 4 holes). Moog 'Cargo Coils' in back
provide a nice ride without raising the rear end and are sufficiently stiff. Get stiffer front springs. '65 442 front springs might be OK. A 455 and a '65 400 weigh the same. FInally use Howe 1" taller front upper ball joints. For rubber I'd use 15x7 Rallye IIs and 235/60-15s. This setup provides very flat cornering and a decent ride.
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