I'm not sure whether it will work with the factory transaxle setup, but I just bought a tank for a '71-'72 Ventura (part number GM46C, also listed at Summit Racing as RSD-AFT7104) to use under my tempest with a Ford 9'' rear axle conversion. It only cost $140 delivered. It looks like it is going to fit under the trunk floor and between the frame rails very well.
To mount, it uses two straps running fore-aft. I happened to have a pair of extra trunk floor supports/strap mounts that look like they are going to fit perfectly to mount the straps to. The tank also does have a long welded-on filler neck that I am going to have to shorten to mate up with the Tempest's fill tube.
Not a simple bolt-in, but perhaps a good option for someone looking for something sort of stock looking that will fit under there.
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