18r has the 4 threaded bosses on the sides of the block for factory mounts, i would build a plate off that with ears to fit over a fabbed mount on the "subframe". instead of 100% solid, pick up some poly leaf spring bushings... and slide them into the correct size round tube, then from the tube sleave to the frame with whatever works best. a simple remove the bolt and lift "up" method for removing the engine. im sure you can whip up something creative and functional...judging from the rest of the project.
