My new 71 Demon project

Well I went ahead with what I was thinking to get the cowl off. Got the main section off minus the ends. I have a couple more questions I hope someone might help me with this time. I Know its lead on the bottom of the a pillars, and I know I need to torch it out, but what else do I need to know? Is there another seam with spot welds underneath? Also, on my replacement piece, i noticed a difference than mine. The inside seam by the windshield channel has a hole that mine does not. And the channel also has tabs. (circled in picture below) I don't know for sure if mine had those since it was rusted out, but can't find any sign of them. Can I still use this piece or is it year specific?