Yeah, it's serious. You did ask for "best performing".
Which QA1 K frame do you have? Lotsa different ones- torsion bar with stock steering and coilover with stock steering will pretty much limit you to a center-sump pan; the coilover with front-steer rack and pinion steering opens up a whole bunch of possibilities for rear-sump or dragster- type pans without having to deal with a crossover tube for the steering centerlink.
Check out Kevco, Canton and Champ to name a few.