Hello all, recently acquired a 73 vette with a 454 BB, however I know it is not the #'s matching engine that it came with (have been told it is out of a 78 Suburban), Anyways my question is. were the original 73 454BB engines that came in Vets a 2 or 4 bolt main. I am looking for another 454 to rebuild and have ready to put in, and I am not too concerned about having the proper date code and stuff, but is it better to go with a 2 of 4 bolt, is there a certain year that is better than others. Also. I have heard that the Q-jets are better than Holleys on BB's, What is the general concensus on that one?