Use RTV on the oil pan. It doesnt use a gasket from the factory. I use Permatex Super Black, but you may have your own preference..

What turbo is that again? 20g? Hope you have a restrictor in the oil feed line. Might wanna look into that, especially if its fed from the OFH. Does the motor have balance shafts? Got an oil pressure gauge? Whats it look like if so?