Steering Arm to Header manifesto

Okay, here's my predicament and I wondered if anybody else had done this or if I'm on my own here.

I want to put a quick ratio steering arm kit in a Dart sport (smallblock) and want to run headers, which according to Firm Feel and PST only allows me to run Schumacher Tri-Y's, no big deal, right? BUT after looking at the Schumacher's I discover that they don't allow to run a manual transmission, another of my planned upgrades... anybody know of another header that would fit or am I going custom?

(I posted this in general because it's a mix of both small block, drivetrain, and steering/suspension tech :violent1:)