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I am not sure which tank you have in your Arntz, but mine did not have baffles of any type. It was a big open tank. After cleaning it out, I added 3 baffles in the tank. This was done with SS plate stock and numerous small holes drilled throughout. Also, I added a small section around the pump pick-up so when going through long curves, it would not run the pump dry. On the return, I built a can around the pump and directed the return to fill up this can. This allows the pump to always be submerged in the gas keeping it cool. I have a Walbro 450lph pump. I ran it through the filter, regulator, then to the engine. The regulator and filter are mounted in the trunk and the return line coming off the regulator is about 6" long. There is no return line traversing the length of the car. Mine is set at 60 psi per the EFI specs. There is no vacuum line, but I originally did install one using aluminum tubing from the engine to the regulator in the trunk.
For the O2 sensors, I added a square block between the header and sidepipe where they bolt together. Mine has 2 O2 sensors. In the block, I drilled and tapped each block for 2 sensors. This allows me to run an AFR monitor on one side, or both sides.
I have probably 4000 miles on this set-up and no problems so far.
Good luck!
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