hi lads and lasses

im needin some information .

I have a rouse 304r and over the winter wil be striping and cleaning her .
i got a new turbo to fit and had a notion of changing the cams

what difference will this give to power output/delivery?.
what cams should i be lookin for bd10s etc?.

bearing in mind that the rouse has a very small turbo for quick pick up
and as standard runs 1 bar of boost to produce 260bhp and 300 ft/lb

any suggestions will be greatly appreciated.
as i am a cossie novice.