Well, in that case it might be different. I thought you had one you had to totally rebuild. If all you want is a little more cam in it, call Summit and see if they have a 265 grind with the notch. You can also call Crane Cams in Daytona Beach Fl (I hear they are back in business) and ask what their part number for a 265 cam would be.
Heck, that sheds a whole new light on it, being a good runner. I'd try to keep it then. I also think the 265's have no provision for a starter to bolt to the block, do you have the transmission and bellhousing too to make that work?
Don