Hey guys my names morgan im new to N4W and I must say this is one of the most knowledgeable forums I have been on and my question is I have a 91 d21 hardbody with 218,000 miles it the timing belt broke on it put a new one on still runs fine but im sure something has a slight bend in it somewhere now I also have been looking through the pages and found alot of discussions on performance upgrades like the cams from a 300zx and I want to do all that stuff to it but with that many miles on it should I rebuild this motor or get a new one to swap in what will bolt in the give me the most power without being to much of a headache any help would be most appreciated.