Hello everyone. I'm fairly new to this forum, but I view it as a great source of information and a chance to get to know some great people. I have a 72 CSI that is in fairly good shape however, I am looking to begin restoration of the vehicle including a powertrain upgrade. I'm considering a few options including installation of a M90 with a 5 speed dog leg, or M88/3 vs S38 or a metric mechanic 3700. Was wondering what opinions anyone here has on these engines, and whether anyone has an M90, M88/3, or S38 available for purchase. Look forward to reading some opinions and suggestions.