1.Power steering is not needed on a small car...reasons in my shop forum articles...I took mine off years ago and made a lightweight block-off plate.

2.A/C...I would look for an A/C bracket that matches the block holes
on the new motor and your current A/C holes,....... maybe pull one off a junkyard car. Get the junkyard belt or write down the part number. Probably someone has done this before and posted it if you do a dogpile.com search.

Did the new motor come with the a/c bracket bolted to the block?
Does the belt line up OK on the pulleys?-Bob