360 LA rear main seal needed….help

What can you guys recommended for me as a great rear main seal? I have a standard felpro one installed now and hess around 1500 miles on it and it leaks :(

The engine is a mild build... flat top hyp. pistons, 10:1 compression, mild cam. This is for a 78' block.

The seal I did use was not a rope seal.... and I think it has leaked since day one. I read if there is knurling on the crank, to use a rope seal??? I want a good seal! Don't mind spending money on it , if its worth it.

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