I have a '72 ES with automatic. It is a BW35 and is somewhat sluggish. I have considered changing to standard, and even have most of the parts to do that. The parts you need include: tranny, bell housing, drive shaft, rear end (different gear ratio), and various bits. For example, the auto kick-down cable snakes up and attaches to the throttle control. I don't know if the standard throttle control has the fitting for the cable. I have heard differing reports on whether the cross-piece supporting the transmission is necessary. E-mail me off-line and let me know what part of the country you are in. If we are close you may be able to compare your set up to mine.