whats my Horsepower gain with these mods?

i am converting my car from a 1bbl stock carb to a holley 350 2bbl and adding a round chrome top K&N filter and bypassing the A/C system. i am also elimating the cat converter and adding a flowmaster 40 seres with a 3'' tip. i was wondering about what my HP will be after thats all done. i know stock rating is around 145.