There is no “front” or “rear” with the heads.

If you swapped the heads side for side, what was the front would become the rear.

I built a 446 for a local guy in 2005. Used the RPM heads and MP covers......FelPro 1612 gaskets..... no leaks in 14 years.
It’s s solid cam, so regularly has the covers off.

You basically need a new set of gaskets each time you pull the covers.