Personally, I would think they would work worse then Cal Tarc's. I didn't have any luck with Cal Trac's, on 2 different cars. The instant center is too short on A bodies, because the front spring half is one of the shortest on any car @ 19"These would make it even shorter as far as I can see.
Foot braking maybe, but no big horse power or trans brakes.I am just sharing my experience, and it wasn't good. There are many that agree with me about Cal Trac's, but there are those that don't too.
I would ladder bar it, or just run SS springs and a snubber, that worked better for me.
They may plant the tires hard on launch, but you may experience tire un-load at 60'.
Good reading here:
http://www.forabodiesonly.com/mopar/showthread.php?t=248409
