If all the links are the correct length AND the axle is is square and centered in the chassis and the wheel opening, you are good to go. I usually tack them and run the whole thing through travel to confirm that it works the way I want it to.
My original rear the tabs sat on top of the axle tubes with the same mock up
1969 frost green camaro
LS3
Speedtech pro touring front subframe
ridetech rear 4-link
moser 12 bolt eaton tru trac 3.73