Looking for 360 engine mounts

Yup. RH is direct bolt on, LH needs 1 longer bolt and a spacer. Or you can buy 68-72 genUine 340 mounts and pay a premium for them.

I recommend bolting up the 2 front bolts on the LH mount, take a caliper and measure the gap between the rear bolt and the block ear, and make a spacer that fits. Or stack a bunch of washers in there.