the special tools are available now from the aftermarket. are you building the upper or lower? If its going behind that 383, you will need to purchase the Mercruiser HD1.5-1 upper gear set and use all Mercruiser bearings(tighter tolerance bearings). If its going behind a regular engine, you can buy a SEI aftermarket drive cheaper than you can build one. If you are bound to build it, pick up a factory Mercruiser manual and its all laid out in there, step by step. Mercruiser has probably the best manuals written, the aftermarket manuals are not so good.
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