Hey bud, First of all WELCOME.
Back in the day we would center the scop. Then with a marker outline the area to cut. Then with saw in hand cut out the opening. Now today they take some type of material to cover the sharp edge. Next take the scop and rivit it to the hood. Next useing bondo lay down an even and smoth surface, after drying/cureing sand it down to primer.
Hope this helps.

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