318 Non-Magnum [Valvetrain question]

I think you'd better tell us "the full story," here.

You can not run a Mopar with the shafts loose on the head saddles!!!!
I have a 3.9 Dodge Dakota and it has a rack just like a 318 I bolted the shafts down and the motor starts to stall , I have never used this type but I bwould think the rounds rack should mount firmly in heads correct , I also have some rocker arm noise of course, thanks Chris