3126 Cat engine down , fuel running into rad .

Well I got a 2002 Sterling Dump truck . last Saturday the engine started pump fuel into the rad and overflow . I figure the seals on the injector tubes got hot and all went downhill from there. It is a 250 hp engine . what other Cat 3126 can I put in there without messing with turbo , injectors . or the ECM. People have told me that I have to stay with the 250 hp class or larger which I want to do . Is there any changes if I find a 300hp ? Thanks