Valve covers

All LA engine valve covers will fit any LA small block ie. 273,318,340, and 360.
They will not fit the Magnum engines.
If they are not hitting real bad, you could probably dent them in a little, where they are hitting. I had to do this once on a cheep set of covers. They were hitting where the breather/ oil filler went on.
Use the good mopar thick grey coloured gaskets P/N5249581,available from Summitt for around $18-20. I have had good luck with these.They are also reuseable.
I like good stock Mopar valve covers I've never had them hit. You can paint them any colour you like.
Good luck
Dave C.