Weiand Action Plus any power gain over factory 340 ?

The best performance dollar spent on the late ‘72 to ‘73 340 is an increase compression. Especially if it’s aluminum heads with a set of head gaskets that make quench. It’s just a shame it takes so many of those “performance dollars” to do that (if you can find any aluminum heads right now!), and it takes more restraint than most folks have to keep it from turning into a rabbit hole. Oh, BTW, that’s a nice looking ride, a personal favorite of mine!