need more tire somehow

Daily driver? If not go with the Wheel Vintique 15x8” and 255/60-15 drag radials .
I have that combo on my 69 340 4sp and hook well as long as I don’t drop the clutch at 5000 rpms . 500+ hp and 500 ft-lbs of torque.
And you have more room in your car .

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well, The wheel vintiques 15x8 has a 4.625 backspace, so not sure thats gonna work because everyone is saying it needs 4.25 backspace