Okay cleaned lambda sensor, wideband, spark plugs and put in the IACV from my other supra. Started well, but AFR still reading 10. Let it run for a while and noticed I still have a small coolant leak above the back of the block from the pipe running out of the heater. Noticed lots of condensation coming out the back, so got it back into the garage and turned it off. Checked the oil cap and it seems to have the dreaded creamy shit under it. So fearing the worst. I cleaned the cap up put it pack on and started it again. Started a little groggy and lots of fuel smoke again, AFR reading 10. Turned it off and checked the oil cap again, same stuff even after i cleaned it. So i think the head gasket has gone, would all of my symptoms make sense.
Then I guess i need to know whats the best way to test to confirm.