john marsey put one in his jbl, might look at his gallery or mail him, he'll prob show up shortly, or ping richard hudgins, he's a wealth of information.
Never played with the idea, but have used front and mid motor plates. You need 4 solid mounting points to gain torsional rigidity from the block. soft mount the tail housing.
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NASA - Instructor - 2012 TTA Champion - We Drive Harder!