I'm trying to work out a design for my neighbor and I's custom headers. I am using standard bends available from Burns Stainless and straight sections of tubing. With these models I can constrain the lengths to be equal and move around the bends until I get the same head losses through each tube. This way each cylinder theoretically flows as well as the others. I tried to keep the pipes as straight as possible coming off the engine and still leave enough clearance around the float bowls and carbs. The Secondaries still have to be sorted but here is some eye candy on the progress. (Also car is LHD so steering column isn't a problem)