A method i utilize is a simple scab plate. Basically 1/8 pice of alum to make a picture frame (about 1" wide). Beat the aluminum to your floor shape then what you cut out goes right back in with a 1/2 "lip" inside the hole 1/2" lip to the floor. Then seal/ blind rivet the "frame" to the underside of the floor. Drill and tap, countersink a few holes...perfcetly flush and formed per it USED to be the floor!
Nice addition...but some cars it is very easy to access the fuel tank so...50/50. My 2nd gen F-body tank drop absolutely sux.
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