"Top end" gasket set

So. I have had my 96 SC 230,000 mile Riviera for a week now, and I gotta say it runs and drives aswome, except the CEL had been on.

Finally got the Scan tool I ordered, and found I had the P1406, and P0171, so looks like I will be searching for a vacuum leak and replacing the EGR.  Oh and a 1441, probably from me overfilling the gas tank.

It has all the records and it's had the coolant elbow, at least one done, ( not sure where the other is) but the one by the alternator is still plastic. 

I bought the Dorman metal ones and AC Delco o rings.

But just looking at the injectors, I don't think they have been replaced. So I was thinking of just doing everything, injectors, lower gaskets, SC Gasket, elbows, TB gasket.

Does anyone make a top end kit, or do you need a full gasket set or just buy them individually?

https://www.rockauto.com/en/catalog/buick,1996,riviera,3.8l+v6+supercharged,1022038,engine,intake+manifold+gasket,5424

https://www.rockauto.com/en/moreinfo.php?pk=1400339&cc=1022038&jsn=487&_nck=ZExt1ysfqhqWnq%2BEvUNdS3Txyey60IDtnjPWF5UU9J0BWQv7pvqZbkEUk86%2BAYIhFUNxSQbBt9G0BIcUFg1e73oBkDLRl78blzN6Ccld9H9fPqgswKu2eD28c4ecmCmnw6go%2FtdWeMh4RQnGPqGljMOqTcFHZySgVVHseR4tIG2gKPYmXSJgHMY1aWoGUXUkasOiCyPRaxYsrvl47Oxwl9PSdpmil0FZnuoqkvM8R3B%2FwnryyojwEtZkkrle7EPBnjvRU%2FIWKNafnvqUtq3kUOZRtlbwPqaUloLaA3JfJIo9AJ4IsxqOmbDsJuyrPyxEYmD%2FM0Kz6pyq2I52OXzMDWjtRvMl7Xsb&jsn=487&_nck=ZExt1ysfqhqWnq%2BEvUNdS3Txyey60IDtnjPWF5UU9J0BWQv7pvqZbkEUk86%2BAYIhFUNxSQbBt9G0BIcUFg1e73oBkDLRl78blzN6Ccld9H9fPqgswKu2eD28c4ecmCmnw6go%2FtdWeMh4RQnGPqGljMOqTcFHZySgVVHseR4tIG2gKPYmXSJgHMY1aWoGUXUkasOiCyPRaxYsrvl47Oxwl9PSdpmil0FZnuoqkvM8R3B%2FwnryyojwEtZkkrle7EPBnjvRU%2FIWKNafnvqUtq3kUOZRtlbwPqaUloLaA3JfJIo9AJ4IsxqOmbDsJuyrPyxEYmD%2FM0Kz6pyq2I52OXzMDWjtRvMl7Xsb

https://www.rockauto.com/en/moreinfo.php?pk=260723&cc=1022038&jsn=495&_nck=ZExt1ysfqhqWnq%2BEvUNdS3Txyey60IDtnjPWF5UU9J0BWQv7pvqZbkEUk86%2BAYIhFUNxSQbBt9G0BIcUFg1e73oBkDLRl78blzN6Ccld9H9fPqgswKu2eD28c4ecmCmnw6go%2FtdWeMh4RQnGPqGljMOqTcFHZySgVVHseR4tIG2gKPYmXSJgHMY1aWoGUXUkasOiCyPRaxYsrvl47Oxwl9PSdpmil0FZnuoqkvM8R3B%2FwnryyojwEtZkkrle7EPBnjvRU%2FIWKNafnvqUtq3kUOZRtlbwPqaUloLaA3JfJIo9AJ4IsxqOmbDsJuyrPyxEYmD%2FM0Kz6pyq2I52OXzMDWjtRvMl7Xsb

so i guess no actual kit with everything. looked at the egr valve, it looks like a 230,000 mile egr valve,

That second felpro kit comes with injector o rings, stat housing gasket, O ring, basically everything you need except the intake to SC gasket. That isn't good enough?

Oh guess it does have everything, thsnks

...my guess is your LIM gasket is sucking wind, or you have a crack in the exhaust manifold.

While you are under there, look at the oil pressure sender. If it has oil around it, replace it - they tend to spray a mist of oil onto the block for a while before they fail, but when they fail they fail hard and your engine will wizz away its oil in seconds at highway speeds.