How much HP would you guess my 340 produces?

How would a cam like that affect drivability? Especially at low speeds?
Thats the next Comp Cam up from mine. You will need a 3000+ convertor to use it and it is happy turning some RPM's. 6000+. Look on comps site thay have dyno charts for each XE grind plus minimum requirements such as compression and convertor.