Hmm. Okay, so it seems that the 604e is exactly pin compatible with the 740 series G3 chips. It's unfortunate that all the G3 chips I have harvested so far from blue and white or beige hG3's all use the later 750 chips which are not pin compatible. I'm not exactly sure what 740 chips were used in other than possibly the "mainstreet" powerbook and I got rid of all my parts for those nasty laptops ages ago.

Edit: No, I am wrong. There was one XSC7400 350mhz chip I pulled but I don't remember what system I pulled that from. Regardless. I'm not sure if I can achieve a speed of 350mhz. That would require an 87.5mhz crystal with the 4X multiplier.