I currently run a stage 1 (exhuast, mikuni, I.M. heads). Wondering if I'll gain any top end speed with the roller rockers, push rods and cam. I know i'll increase load which is what im looking for but didn't know if any extra mph was a bonus.

You may gain a little bit with the cam. The rr's and push rods seem to be a debated topic, though most seem to agree they are not worth the money for the small gains (if any) you will gain from them.

Cam yes.
rocker rollers and push rods no

You can search for your answers on here. I recently asked these questions and was told they were not needed. I had already forked out the dough, and I am currently running them, but if I would have known before hand, I probably would not have spent the money. I will say that those who use the rollers and rods say you will get the most out of them when pairing with a cam, but still probably not worth the money...

Go do some reading and chose for yourself, but they are not a must have to answer your question.

If you want more speed and load change out your intake. Last bolt on you can do. Rollers are not needed at that high rpm just advised for operator comfort.