Timing Cover Question

Hi I've done some searching but I cant seem to find an answer to a couple questions.

I have a 360 short block I'm going to be sending to the machine shop in the future and will be needing some parts and advice (likely many more than this as I progress) But to start...

Q1: Is there a difference between 318 & 360 timing covers 1975 and up?

Q2: If I have the crank internally balanced, can I use a damper from a 318 and a regular balanced flexplate and TQ?

Thanx