Might want to talk to Lycon or Performance Engines. I remember one of the two taking the big-journal cranks like you have and making a stroker out of it, by moving the journal center out and grinding them down to use light-crank rods.
I think you have the best of both worlds at the expense of weight. The K-series also has the big oil pump, which is desirable. The K-series also has a tuned induction system, but its heavy.