On your 60-62 frame, you can use 67-72 V8 mounts.
Or if you use 63-66 mounts, you'll have to use a 1/2 inch spacer between the top rail of the frame to the underside of the top portion of the motor mount stand/perch.
Here's mine with 63-66 stands/perches.
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Here's another post from another thread:
http://67-72chevytrucks.com/vboard/s...69#post5427669