literally two of my favorite compounds... i recently ran them together and it was THE SHIT bro... you absolutely can use rad instead... it has some similarities but rad is more versatile... anavar is more pronounced with its hardening effects but rad does a variety of things so you definitely cant go wrong but i would consider stacking them together
RAD-140 is extremely strong and you can definitely substitute it for anavar and get tremendous and similar like results however I would consider stacking them together