Right now I'm heads/cam running the stock rockers. I'm eventually either gonna get the trunions or some yella terra rockers. Is it really worth going to the yellla terras over stock rockers with the trunions? Whats the difference?

 

I have the 'new' yellas with less mass than the old ones.
Some people keep the stock rockers bec they have less mass than the Yellas.
On the other hand, Yellas are supposed to have less flex than the stock ones, and they are fully rollerized. I like the idea of having less flex.
From here, there is a debate about whether the rollers actually rotate enough under engine speeds to cause less friction than the stockers, or to help realize any more horsepower than the stockers.

There are a number of threads about this if you do a search.

 

I have the new yellas also, before them I had the trunion upgrade in the stockers, the yellas are a nice piece, and you pay for it. Personally, if you think you are gonna get any power increase from the swap, I would say NO.