I managed to break the proctor mast.... yes, I know. Rudy at DR Marine hooked me up with a replacement stock extrusion which I have been carefully refitting for a second try

I could use some help from the experts here.
I am trying to figure out where to mount the shroud tangs and the forestay tang on the mast. I was able to lay everything else out against the old mast but I am puzzling over where the stays and jib block would go measurement wise..... The old proctor spar was tapered and so bent up by "treemageddon" that I am a little gun shy about just drilling holes where I think it "looks like" the tangs should go. Any suggestion would be greatly appreciated. I have the measurements from the class association.... but... it looks like I have to put it all up to band and measure from the bands. Anyone know measurements "from the top of the mast" that would keep her class legal?
Thanks.