That's exactly why we put the 200cc Pro Toplines on my friend's 327. I will be building a 383 for him this winter. If you eventually will put them on a 350 either 180cc or 200cc head should work well.
If the RPMs will be lower and it'll be more of a street combo then 180cc heads would work well; if its a max performance street/strip type combo you might get a little more out of it with the 200cc's (of course you'll need more compression and more cam to take advantage of the bigger heads).
It depends on the brand and flow characteristics etc, too. My suggestion would be the ProTopline 180cc heads. They should work well on your 327 and on a 350. The ProTopline 180's flow as good or better than the Dart Iron Eagle 200's if I recall. There are some other very good heads out there (like the AFR 180's) and Trick Flow 195's but you can't beat ProTopline's prices - they are good quality too.
E85 racer and E85 carb builder
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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle