late model v-8 motor change

[squirtis]

Hey guys, new here, looking to change out the motor in the v20.

We are looking at putting an 89 chevy 350 motor in where used to be a 79 model chevy 350.

Here's my immediate question, the crank to outdrive bolt pattern is different. Is there a conversion kit, or adapter for going to late model motors from the old ones? It's got a mercury outdrive on it.

Thanks for the help if ya can..

Curtis