Cold exhaust, hot valve cover.

Hello. I have a new issue that has come about with my 440. First, some background. It's a new engine. (Maybe an 2 hours of run time and less than 5 miles of actual driving) It was built last year but was recently stripped to a short block to investigate a noise. It ended up being nothing of any significance and the engine was reassembled. It still needs to be fine tuned but it runs and drives fine.

Now the issue is the passenger side valve cover gets very hot, especially compared to the drivers side. Then the exhaust on the passenger side is cold. The drivers side is normal, I can touch the valve cover with no problem and the exhaust is warm. I've looked into this a little online but haven't really found anything of use. Any input is appreciated.

Here are some specs on the engine:
Engine:
493.41 cu. in.
10.89 compression
Bore 4.35
Stroke 4.15
Trick flow 240 cylinder head
Edelbrock troker 2, single pane intake manifold
Holly 850 double pumper
Harland sharp 1.6 rockers
Crane roller cam duration 234/242, lift .575/.595* (689551)
Howard roller lifters
Eagle crank and rods
Doug 2in headers