No the plentum is just sitting on the intake with some bolts loosely aligning it, but with the plentum gasket removed slowing it to sit flush. I did go bold last night, and took the fuel rail in my hands with thumbs under the cross rail, and gently applied some force. When I reinstalled it did feel better, but when I went further on a second pass the results were negative. I got it to where the tabs of the rail are perfectly flat on the top of the intake, and back to the original improved level of the first pass. So I suppose I just need to keep fitteling, and probably install new orings as previously suggested. There are two injector designs in the mercruiser schematic. Any idea on identifying which I have without an ESN?