=stern drive question

[spareparts]

drives during those years are usually referred to by the horse power designation of the engine in front of it, in your case it would be a 165. Most of those drives are generally referred to as MC-1 drives, the MR(Mercruiser revised) drive was an early version of the Alpha 1, having the upper drive shaft bearing in the lower unit flipped over for better load control. The true Alpha one had a redesigned upper gear case to go with the internal changes of the lower. If you want to up grade an MC1 to an Alpha 1, you will need to keep the input shaft off of your drive