I am planning on picking up this stock supposedly 76 or 77 c4 tomorrow night. THe guy said it was working fine when removed, but he doesn't know what type of wagon or if its a 76 or 77. So, what I am getting at, is does it matter? Also, I plan on building it up obviously as its not going to handle what I want to throw at it anytime soon, but what would I need for it to hold about 450rwhp? 600? 800? Minimum requirements here.