Hi and welcome to the forum!
Just checking through the rides list I think the below list would be best suited (this goes on what I have seen in the past, and myself with a 46" chest)
TH13TEEN (Strong possibility)
Nemesis (if you choose the big boy seat)
Oblivion (if you choose the big boy seat)
Enough there to keep you amused all day
Also! Don't forget there is "test seats" outside some of the coasters you can try before you ride
And, check this http://forum.towerstimes.co.uk/alton-to ... ns-on-air/
there is some guide lines on the sizes for chests.