Spare tire well delete

It is more than just adding 2 gal.
A lot more room for exhaust tail pipes. This is the biggest reason
A flat trunk floor. I run a Sure Grip and want a bigger spare.
Actually the 71-up 4 nipple tank is only 16 gal.
I have a 70 no nipple tank which is 18 gal but the filler tube does not line up correctly in the hole of the trunk pan.
I've seen that Tanks Inc shows a 18 gal 4 nipple 70-1 tank.
I would like to go back to a 71-up style of vapor venting.
I'm also thinking that with a big flat trunk pan I could have a longer more narrow tank made that is like 22-24 gal and still have room for exhaust. I do plan on driving this car the 500 mile trip to Vegas and maybe the 800 mile trip to the Fling.