Yea... if you think about it, send me a PM before you build either. I can point out ... some things that matter and some that don't.
Strut tower mods are pretty extreme and banned in many racing classes. But they
are allowed in some classes, to either add
negative camber or positive caster adjustment travel, or... to change the bump travel, strength of the tower, mounting methods, etc. Depends on where you race. For the S197, the Boss302S comes with a modified strut tower from the factory.
You can see how far they cut the strut tower opening. But it ain't for more caster.... they do it ALL for more negative camber. Like I keep saying...
The MultiMatic (??) camber/caster plates used on the 302-S/R (see above) has an
extreme amount of inboard adjustment built in, and only works on an S197 chassis with the strut tower opening cut up (a lot). But it is all for adding
more negative camber, NOT extra positive caster.
Cheers,