I have read some of the other posts but i was not able to find any info on what i was looking for. I just bought a 350, come to know now a GM Target Master 350. I went to go buy some exuast gaskets for it and i could not find any that would fit? I went to my old 350 and took one of my headers off, and put it up against the TM and it did not fit, it was to short. Why is it like this? its a 350 from GM...arent all 350s the same? block wise?