i saw a youtube video of a build and the guy made a brilliant crossover, which i'm considering even though i already bought shit for the way i was going to do it.
he basically left the exhaust manifolds totally how the are, and removed the stock exhaust crossover behind the engine, made his own crossover that went straight into the exit of the passenger side manifold, then cut a hole in the front of the passenger exhaust manifold and welded a flange onto the manifold right there. amazing never thought of that