How much should I charge for polishing the bottom end from a Quadzilla? - Wilmott Electronic Media Limited

Sombody would like me to polish the bottem end of a Quadzilla engine for him(pics below). I was thinking to charge $300. I dont want to over or under charge him, so let me know what you think I should charge. The only covers I can do on the bench polisher are the stator, clutch and water pump cover. The center cases I'll have to do with a die grinder. I can't take the cylinder off, so that will make it harder. My main concern is the case by the stator cover, has alot of nooks and cranies. How long would it take you to polish it? Here are some pics of a Quadzilla engine.