[Pinballer]

Thanks for the drawing Ed, that's really close to what I envisioned trying to make to cinch down the headers. Appreciate that greatly, as now I know it should work OK.
The fuel cell--I also intended to mount it where the original tank was, because that's about the only way I could do it within the rules. I was looking at trying to find a way to access it from the license plate area somehow, it would make filling it up a lot easier, but that may go by the wayside. I reserved space to make a trap door on the right side of the hatchback floor area just in case I had to go that way, and if it does that would match your build on the Gremlin. The complication of that for me is to find a spot in the back to park a weight box where I may need to add 30-50 lbs depending on track scales. I'm already keeping the space-saver spare tire, the jack, and the tire tool for weight and they're all on the left side. Real estate is pretty precious in a small car!

The header pictures: the one where everything is assembled onto the correct head destined to go onto the car soon--that one is not the "ideal" header to use, it's an off the shelf Hedman, but it's all I have right now that will fit into the car. Got to be better than the factory exhaust manifold.
The picture showing the header that's all cut up is going to be the start of a custom built set that will clear everything easily, sweep back across the engine as needed, and use a "3 tubes into one collector--times two idea". A lot of the Hedman Jeep headers are using that same set-up, they have two collectors on them-- the three into two design, but Jeep headers will in no way shape or form fit a car.