Another ? about 273 heads on a 318

I know this has been discussed here, but...

If you didn't see in my other thread I'm hopefully picking up a 66 Dart GT with a 273 soon, as a donor car for my Dart 318 with the goal of 320+hp.

My 318 dates from 1968

My original plan was to use KB 167 pistons to get close to zero deck height in my 318. However if I use the 273 heads and stock pistons will that gain me the compression I'm looking for? I'd like to be around 9.0-9.2. My other consideration was to take the 318 block to .030 over for more compression. Still a good idea if I'm using '66 273 closed chamber heads?

If I use the 273 heads I'll take them to get a valve job done with hardened seats...will I need larger ports to get the HP I'm after?

I had already bought Eagle I Beam rods, but if I use the stock pistons would it be better to use the stock rods as well?