I just had a flat piece welded to the end of that angle iron that set the angle. I also cross measured mine to make sure it stayed square. then after I got the A-pillar put on (tacked it in 2 places) so I could adjust it if I had to. I measured it and aligned it up ,then welded the flat piece to the a-pillar just for rigidity since I know I'd be welding and grinding on that area and it might "heat" move on me.. but DANG you sure are going as deep as I did. good luck, Fun aint it? and lots of spotwelds .. I seam sealed the top hats and all my spotwelds that were internal to the cowl, epoxy sealer also to help stop rust shot the lip area with weldthrough primer and lots of seam sealer in that area too since I don't want to do that again.
