Okay so I am kinda new here. I might probably get flamed for this but....... I was looking at purchasing an rb20 with Mckinney mounts and drive shaft from another member here. The mounts and drive shaft are for a 76 280z. I cannot find any conclusive information in writing on weather these mounts and drive shaft would interchange with a 73 240z. When I got on Mckinneys website and looked at he pictures of their 240z it shows the mounts for the 240, 260, and 280. They look slightly different. But here and there on some forums I have read that the stock motors (240, 260, and 280) can be interchanged with some exceptions. I can do some slight modification to the mounts if i have to. I just do not want to put it all in and not be able to use the drive shaft or something of the like (seeing as how I am paying for it). Sorry that I had to ask but i can not buy this setup based off of some chopped up information, and that is all I can seem to find. I need to be sure it will all work. Thank You, anyone that can help me out..... To everyone else no sweat I have my Nomex on.