What SWAY BAR to choose

Dcooper said

Im trying to decide on front sway bar right now and came across this. My question is, "is the 55917 more effective with the LCA mounts outboard of the the strut rods than would be the 55905 which is inboard?" It seems a matter of leverages. I can weld tabs and fab mounts as needed but don't want to spend the additional unless there is a definite performance improvement. i'm doing 1.08 bars and probably hotchkiss shocks or Bergmans Fox shocks. Car will but mostly street with a couple autocross events a year. Already have Qa1 UCAs and rebuilt everything in the front. Rear has Hotchkiss springs.
Also thinking the 55905 wouldn't limit tire clearance being inboard of the strut rods. (planning on running 245 17 on 17x8 5.6bs.
Thanks to everyone for all the excellent info!
This is for 73 Plymouth Scamp

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The Hellwig #55905 and #55917 are for different model years. The #55905 is for '73-76, and the #55917 is for '67-72. It's not just a matter of the location of the sway bar tabs either, the entire bar is mounted differently. The 73+ sway bars are routed through the K frame, the '67-72 bars are not.

So, with your car being a '73 you should be getting the #55905. The '73+ design is better overall, it saves a ton of ground clearance vs the earlier style. Technically the location on the LCA's might not be quite as efficient, but there are other changes as well in the length of the sway bar legs etc that also change the rate that the sway bar will add to the suspension.

And realistically, unless you've determined the exact roll couple for your car and its complete suspension and tire combination along with your driving style, the differences in the available sway bars probably isn't going to make a big difference compared to other components (like torsion bars, tire compounds etc). And if you have done all of that and need additional fine tuning, it's likely you'd need a custom sway bar to get what you need anyway.