Is your 327 a small or large-journal block? Be aware that in 1968 the bearing sizes were made larger, and a '67 and back 327 crank won't work in a '68-'69 block. You can tell easily, because the '67 and back engines had a canister oil filter instead of a spin-on filter, and there was a breather tube in the back of the block beside the distributor. The specs on a 302 are simple: 4" bore x 3" stroke. All small-blocks used 5.7" rods except for the 400. The difference in 302, 327 and 350 pistons is the pin height. You just order 302 pistons.
Oddlly enough, if your 327 is a small-journal, and you have access to a 283, you can use the 327 block and rods, 283 crank (which is a 3" stroke), and the 302 pistons. As a plus, 283 cranks were forged steel instead of cast iron, as were 327 cranks up to 1968, when they went to iron.
If it's a '68-'69 327, you'll need a 3" stroke large-journal crank and 302 pistons. Everything else is the same as far as the specs.
Hope this helps!