I agree with Larry.
First off welcome to HybridZ, all the information you are looking for will be here. Secondly, the questions you are asking have already been asked and the information is here just waiting for you to search for it. Use the search and enter things like 327, 400, LT1, LS1, T56, R200. You will find just about everything you're looking for. After you review all the data, you will be better educated about your options. If you still have questions that you can't find the answer for, then ask them. It makes it a lot easier if you do some research first.