"....Will the gas filler stay in the stock location? ...."

No, one way or another the tank will be re-located and the hole filled.

This isn't 100% set in concrete, but more more I look at it the more I like it.

6702384-kegtank.JPG (313 downloads)

1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold
1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold
1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)