@my68barracuda - awesome work here John, it's great to see it all coming together! Love the headlamp ram-air!!
Question on the valve springs, do you recall the vendor and part number? I too have decided to go with early 289 valves and this is just what I'm looking for.
I will look that up tomorrow and post it. The springs that I selected were a good match for open and closed pressure with the cam that I am using, they may not be a direct carry over for you.