Got it. Let’s forget about the 347. I just wanted to talk about the parts for my 331 and hopefully they can help someone who is trying to put a parts list together. Also give some horsepower guesses before it hits the dyno.I dont think you realize how long Corral.net has been online with many of its knowledgeable members. For 20+ years of seeing hundreds if not thousands of 347 build threads, a lot of us know what parts it takes to make 550hp 347's. You said that 347 even had a milder cam than yours correct?? The 11r heads, Victor jr and 750dp will support a 550hp 347 but NOT with a MILD hydraulic roller cam.