Thanks for both those replies gentlemen, the owner has since informed me that the tranny is a Borg Warner Velvet Drive, model 1017010 Rat 2-101 Serial
Number No 7192 if that makes any difference. I've used speedy sleeves many times in the past and they can be lifesavers in times like these. The workplace could have your dinner eaten off the floor, absolutely spotless. I would imagine that the biggest issue will be how much the drive shaft can be pushed rearwards before fouling the rudder
. How much room is required to lift
the transmission clear and free from the engine, 100mm?