Pushrods, how do I measure for...

i have a ball ball adjustable you can borrow if you want to pay the shipping. I am in washington state

Wow, thanks (Discharged) I will ask the guy who is looking after the car now add I'm basically an idiot when it comes to "hands on mechanical" issues....
But we bought some tool that looked like a Pushrod that screwed in on top add if it would extend higher with the top screw and this tool (all this is mechanic talking to me, I'm lost) would get longer as you turned the top part...i can see it being called a ball ball etc but this tool itself bent so he is ordering another to measure it again. (This time ordered 2 lol) I think he screwed it to high and that's why I bent ? Maybe he should have gone in small increments but that again is not telling me how he will figure out what's the exact measurements.. I know it's supposed to measure between 7.8 to 8.Something...
The car has crane cam roller rockers with a 590 solid cam..(mopar cam )
Talking to a grant here also who I hope will help me out.

Reason we are changing them is they were heard making some noise and when the covers were taken off we realized they were loose... Just lucky to see it before anything else could have happened. Car is running rich also .. Can this be the reason ? Car ran real well and is barely a cpl'm of thousand miles on a fresh rebuild.
Have W-2 heads and was thinking of swapping these 340 heads but now I'm getting nervous as I thought it was just a few bolts here and there, swap the heads and of I go..... nope!

Thanks for all the help thus far.