need help

ive just got a rx7 82 thats got a 13b bridgeport in it that needs rebuild cam out of another car as my car is stamped with 12a on it can anyone tell me how i can tell what model moter it is and also been offerd a standard s4 13bt motor what will be faster and more reliable the 13bridgeport or 13t

first my freind rotorys do not have cams haha just kidin. unless you like wrenchen on your car alot and dont mind alot of maintnece then you probably wont find a 13b that you consider reliable. now with that said i consider m car very reliable you just got to understand how it work and know some trix. both of them motors will have there own issues, the turbo will require extra maint and the bp is a mod motor and anything modified loses reliability. what kind of probs r u havin?