So, I had the 340 looked over by the same well respected Mopar Engine builder that built the engine back in 2012. His opinion, (without fully stripping it down) is there is evidence of light damage on a couple of Lifters and Push Rods these same lifters/push-rods had a poor leak down test, so he thinks maybe their valves are a touch bent. Ive now got the 340 back at my place and will replace the lifters and rods when I get the time and have a look at the valves. The heads are a little crusty so will lap the valves in again.
The bores look almost freshly built as well.
Its been build with some nice parts. Ive listed what I can do on a word doc. Would anyone be willing to take a guess at the HP/torque it would make?