E
Head aliment is a relative term since everybody is different. My thinking is that it probably won't matter. I had an early .356 Big Bore w/o the crossbolt. I did not have any problems getting down on the stock to aline the sights. Therefore, for my body style, a peep site would be just fine.
I remember something about the angled screws, but it would be best to contact the mfg. of the ghostring/peep sight you want to get and ask them directly if this would be a problem in mounting them to your particular rifle.
Prospector
EVERY TUB HAS TO SIT ON ITS OWN BOTTOM.