360 LA one piece oil pan gasket?

I know the 5.2 Mag pan works on a 340.. a buddy of mine has done it.
I spent $60 on a one piece rubberized gasket in the past.. I ended up throwing it as far as I could. Though I have been sealing oil pans for decades with traditional gaskets with good results, the one piece did not.
Despite how they're advertised, you still have to use sealant in the corners, and the silicone doesn't adhere to the rubberized material well enough, and leaks.