The TFS R's will work nicely or the high-port Street Heats. I've heard that the AFR's are good, but really don't know much about the design or application.
Really any quality head that you go with should have a good 3 angle valve job and maybe a little clean-up work done just to smooth everything out. You don't have to do full bore "porting", just clean up and a valve seating.
Good luck with the 347 - should be one nasty motor!!!
E
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1991 5.0 LX Coupe - 38,000 miles
13.17 @ 106.14 mph w/ 2.138 60'