What SWAY BAR to choose?

Post up a picture of your K member.
The 1973-76 V8 K member offers what I think is the best design for motor mounts and sway bar mounting. The bar runs through the inside of the K member like so:
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That sway bar is a semi-custom job I have used in several other cars. It is an 1 1/4" bar from a 1973-88 Chevy 1 ton 2wd truck.
Back on point. The 73-76 K member has the same dimensions as the earlier ones so It fits all A bodies from 1967 to 1976.
If you have the original K member, you are limited to a sway bar that bolts out in front of the K member.