Hey Mate,
once you've overbored a normal 26 there isn't really much to displacement to be gained by going to a 2.7.
A 2.8 is the smallest stroker I would consider.
in my situation the only costs I have are parts and machining.
through my research I found the RB30 to be less cost effective than a 2,8 stroker or a normal 26.
Unless people know cheaper places to buy stuff than I have found, which is one of the points of this thread lol.
Cheers,
Mitch.