The reverse split cams came from high pressure in the exhaust. Now that turbines wheels are getting so much better, Q trim, Garrett GT, We are going the other way. With a P trim wheel like you have I would go single pattern around 224 and I would also tighten up the lobe center a bit, 112 or 113. I can here the comments about that already but MANY high HP turbo cams work well this way. Factory Buick GN cams which were special to that car were ground on a 107.
Mike