It's not a dumb question at all. Certainly you could just go with a decked head. However, you would be able take advantage of removing your head at the time of decking, by porting and polishing as well as a radiused valve job. You're not going to see big gains with just decking, though.Actually, this probably seems like a dumb question, but I'll ask anyway.
If you deck the head, that raises your compression, right?
Can you just deck your head, or do you need to do the whole thing?