I have about 17” from the bottom of the transmission bell housing to the floor. The car’s back end is about 8” higher than the front end. I think the front end should be higher. If I add a 4X4 spacer between the jack and the front jacking point I can get the front up another 4” and then lower the rear a little. Is 17" high enough?

Photo~
Third time’s a charm: On my third attempt to remove the filler tube, I wedged a 4X4 betwixt a crescent wrench and the frame then used a small jack to encourage the filler tube nut to turn. It fought back all the way. The last three turns took two of us pulling the wrench using a bar through the combination wrench’s closed end.
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Tom F Back to three 940s. Mods, RainX. Lien holder on two more (the kid's). Rust in pieces, '78 245