I have one from PA Racing with the stock type motor mounts, its a small block witha Hamburger oil pan which has a little deeper front than a stock pan and I could get it off. They will build you one with a lower cross bar if you give them dimensions.
My AJE has plenty of room to drop the pan, I don't even touch the motor mounts. Have swapped oil pumps right at the track, not that I really wanted to! Look at the picture, the black line right behind the rack is the only thing close to the oil pan, and it is in front of it.
My spohn has plenty of room to get the pan out too. They also give you the option for different braces, etc. when ordering. It sounds to me like you can pull the pan off with just about all of the aftermarket k-members.