Can you still get your hands on some Superdrol?
Anyway, if you are going to do a short cycle of anything, I wouldn't bother going further than 2 weeks. After 2 weeks is when most of the worst supression occurs, so if you stick to 2 weeks, you should recover a lot faster.
I think you might have the best success if you take it during the 5s, or possibly on the last week of 5s and first week of post-5s. Increase frequency and volume if you want to, but I don't think it's really that necessary. The important thing is that you keep lifting during PCT which would be optimally 4 weeks after you are off the Superdrol... at least that's what I would do. If you increased frequency while on, drop it back down while off it, but keep your weights the same. You'll probably have to drop your volume a bit too if you were doing a lot more sets.
Don't expect huge miracles from Superdrol - it's not the best mass builder, but I have heard decent results from several people, especially some appreciable strength gains.
Personally, if you are willing to use AAS, I would just go with test instead of Superdrol. Test might even be cheaper, but if Superdrol is all you can get...