I have a 2004 mach 1 with 140,000 miles. I'm looking to rebuild it or buy a short block. I really just want the best bang for the buck. I was thinking about going with the MMR 5.0 stroker street mod 900s short block, Stock heads, 98 cobra cams, and a custom tune. I want to make the most power i can without sacrificing driveability or too many M.P.G's. Close to 400 N/A H.P. would be nice. Would this be a good combination or would you recommend something else? Also what problems or obstacles might i encounter?