[73gmc454]

My 83 was in a fire and sat open for over a year before I bought it , the dash was almost rusted off , I cut it off with a cut off wheel 3/4" from where it meets/welds up to the window seal, I cut the donor right below the window seal, overlapped and riveted it to the 3/4" lip I left there , let me know how the vent hole works I need to do the same thing ,