Last year i did a partial rebuild to a sbc with a mild cam and did an initial break in. I know for certain it was rich when this was done. At that time i had an oil pressure of roughly 40psi at idle and 55 climbing through rpms. But today was the first time i had been in the garage in some time and things changed. I had a header leak and that was my first issue i attempted to address, then i would follow with tuning it. I believe it was still rich, it made enough smoke to run anyone out the garage and my exhaust is black enough to wipe on a canvas and make a charcoal painting. It Burned my eyes as it has done the very few times ive ran it. But after fixing the leak at the header, i peaked at the guages and my oil pressure now maintains roughly 25 at idle. Long story short, turned it off, cooled down, checked oil and it smells like gas. Any clues as to EXACTLY what happened and where i went wrong? Not sure if it matters but yes it is the original break in oil. Obviously before i run her again she will get fresh oil. But any help would be more than appreciated what to do?