Depends - like most other things there are increasing levels of complexity.
First do not think like a BB. Think maintaining power to weight ratio for extended periods. However like BB there is no substitute for hard training and a good diet. That being said drugs can (and do) enhance.
To...
There is not a whole lot of information about AAS and the effect on endurance training. Specifically, will one get a marked benefit from AAS if ONLY doing endurance training (no weight training at all)? That is, will one see an increase in max VO2 or an increase in Lactate Threshold by doing a...