Testing car in gear while stationery.

I have a installed a Ridetech 4-link in my 1970 Mach 1. Eversense it was installed the car makes a "clunk" sound when on and off throttle. Several people have looked at the car and I know everything is tight and holes for lower control arms are not wallowed out. Some improvement was made when a gap was increased between the floor pan under the back seat and the bolt in cradle. What I think I need now is a setup so I can look under the car while it's in gear and I can put in 1st gear and go in and off the throttle (I have Tremec Magnum 6 speed). I might be able to see what is moving and where contact is causing the clunk. Something like a dyno set up comes to mind. Any other ideas?
 
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They are R joints. Similar to below.