I checked out big r, those mounts look very adjustable. The top of the energy suspension bushing seems to take more space away from the header area than stock mounts.
The mounts I'm developing will be a direct replacement to stock MII engine mounts and would still work with stock V8 frame mounts. The polyurethane rubber is cast into the mounts, and can be different levels of stiffness. My end goal is drag and drive cars, so I'd like to have the option to make them almost solid mounts, while still able to cast stock feeling versions. The Pinto frame mounts I want to make for V8 probably will not have all the adjustment slots. Slots just introduce weak points. I may make two versions, one set putting the v8 in the stock 2.3L bell housing position, and one with the 1" set back everyone says to do. Each set would still work with stock MII engine mounts. Personally I want to be able to remove the transmission with out pulling the engine. So I want firewall space.
Once Spring finally breaks through the snow around here, things will be happing faster for me. lol