Oil blow by

[truckin 79]

Well I have the heat riser valve hooked up to constant manifold vacuum so that is one less thing to worry about. The truck has a newer convertor the old pancake one is replaced. I have seen a video that says you can take old convertor off and just let it soak in dish soap. Luckily the convertor should be pretty easy to get to and I can look to see if it is melted or just clogged. Anyone have tips on cleaning the convertor? The truck has about 160k miles on it I think somewhere around there.
Thanks