You're better off with a shaft style steering setup, if you have much deflection to get around the headers. Again, the Vega box sits under the left front corner of the engine and is usually fairly easy to get a shaft to.
Remember, most of the contemporary GM cars have a steering shaft that turns almost straight down at the firewall and then turns again (U-Joints) to angle into the steering box. Hardest part is locating the intermediate "Spherical bearings" and their supports . . .
Shouldn't be much of a mountain for a climber . . .
Flexible steering shafts are like Throttle cables, if you can use a mechanical type, or linkage, do it. It's a whole lot more bulletproof in the end . . .
But there are instances . . . .