12 Second N/A Slant 6?
It seem head flow is limiting factor here the bigger cams make less power across the board except between 6000-7000, Yellow line 256 cam, Maroon line 262 cam, Red line 270, 256 cam
289HP@6000 292ft-lb@4500, 262 cam
291HP@6000 287ft-lb@4500, 270 cam
287HP@6000 275ft-lb@4500-5000