There are some on youtube with numbers. here is one of our own guys with youtube link to his 475hp 347;viewtopic.php?f=4&t=5108&hilit=347+on+the+dyno
I have a 347 in my 65. I wasn't out for a stem winder as Pop calls them , & is probably what you have in mind, but I wanted a good fun street motor. Rpm heads, airgap intake,600 cfm 4100, retro fit roller 283 thumper 1900-5600 rpm,10.4:1 comp,Eagle stroker kit ,cast crank with I beam rods, KB flattops.it's more of a street kit, but I can have tons of fun under 5 grand.so I don't need forged internals but still makes loads of good clean fun torque . But if I ever get the itch to start going to the track some, a different cam wont be near as hard as all the safety upgrades that I would need.