I want a very fast, pretty e21 but I am on limited funds, Should I try and try to get a 323, or should I get an ultra cheap 320i and modify it over time? How easy is it to swap a 2.7L eta engine into the 320i? Will it bolt up to the 5 speed OD that comes with the 320i? Is it possible to put an e30's rear disc brakes on the back of a 320i (that came with drums)? How hard would that be?