Unless Your building a race engine I would strongly recommend getting a tri y design header.
Northwest Offroad or Doug thorly
I believe it’s well-known that the Doug Thorley tri-y design produces better flow and increased torque where most of us want it – the low to mid RPM range.
The LCE 4-into-1 design is a very quality header, and touted by many Toyota guys. However the 4-into-1 is known to produce higher power at the high RPM range, sacrificing lower RPM torque.
The Doug Thorley ceramic header is an excellent choice for the 22R, unless, like Bgen said, you are building a race engine and you are looking for increased HP at 5,000+ RPMs most of the time.
By the way... on your Redline 268 cam... the rockers may not be off on the rack. What may be the issue is the camshaft and inaccurate location of the cam lobes.
What you should be looking at is where the tip of the valve stem sits on the rocker adjustment screw.
Based upon my EB 261C cam, I have a suspicion that the castings, probably coming from one of the foundries in China, are just very poor.