1988 3.0 Mercruiser 140 hp questions

[fdheld34]

I am trying to figure out if a 1988 3.0 Mercruiser 140 hp motor will mate with a mercruiser pre alpha series outdrive. I have an opportunity to purchase the motor and want to make sure it will in fact mate up with the pre alpha. The person I am purchasing the motor from says of course..but looking for more opinions. It will be going into a boat that currently has an older 3.0 in it already.
Any help appreciated....Tim???...anyone