The Plenum issue is caused by the plate and housing being made of 2 different metals. Over time, the 2 metals expand and contract at different rates, and eventually the gasket pops and you get the plenum issue.
The Huges pan will completely eliminate the plenum issue, as its made of a different metal that wont mess up the gasket.
That bieng said, if your not planning on having the truck for a long while, just do the gasket. New gasket will last a few years at least. The kit is more of a perminant fix.