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I went through and replaced the rubber lines and the o rings and cups for my fuel system. While I was doing this, I noticed something on this motor that my other IDI motors did not have.
On the cylinder closest to the front on the passenger side, there is some sort of shim between where the steel fuel line connects to the injector. The shim is about 1 inch or so. It is just threaded on, and lifts the steel fuel line about an inch or so higher from the cup than all the other fuel lines.