What parts can be interchanged among the 3SFE engine? Specially Heads! Can I use a 4AGE engine head on a 3SFE Engine? Or a 3SGTE head on a 3SFE Block? So on and so forth. How much can a 3SFE engine handle? Can it handle a Turbo T3/T4 with a shot of NOS? Camshaft, which can be changed among themselves?