If your on a tight budget just get a good port job and the supporting mods (shift, pancacke bearing etc) you might be able to do that for 500-600. If you want to make it better do the head mod and have domes cut by your builder.
My Redline 4mil stocker was about 1400 and I had the head. I had PC pipes at the time and used stock carbs with driveline bowls. So that's roughly what it would cost you for that.
Personally if I were you I would by the DL cylinders and build a 392. Down the road if you wanted more power you get a port job carbs and inframe drag pipes and I bet you'll see an increase of 10-15 hp.
That's my 2 cents