What makes you say it will make it harder to align Tom?
Since they're basically just keeping things at the stock angles (or close enough), the alignment should show a more stock-like reading. And since it's better than an average chance his caster readings were too low from the factory to begin with, having an additional 4 degrees to play with is a total bonus on a '71 like his.
Other than some additional flex maybe, causing some inconsistencies, I don't see them as being an issue.
And he's not expecting it to spend much time on trails at this point either (though hopefully that'll change a bit someday? ;D ) so ground clearance isn't an issue at all.
I have 7 degree bushings and 3.5" of lift and have less than 2° positive caster. Having 4 more would be sweet!
Paul