I''m thinking it either the rear main seal or the headgasket, but I get no anti-freeze in the oil or white smoke, any suggestions

95 GS Greddy SP, KYB AGX, Progress springs(suck),custom intake,HP strut tower bar $30(proud),15$ camber mod, symborski shift kit,high flo cat,msd coil, 10.3mm wires,ss autocrome header,getting goldline springs
donations are accepted, no offer refused