don't completely understand 'cam timing'. I do understand long duration cams need higher rpm and lsa can broaden or narrow power curve but my knowledge ends there, maybe sooner! this van is the ONLY vehicle with an auto that I swapped cams in. also the only inline that I took this far. had a th350 behind the 250 and was o.k. with the 218 @ 50 cam but a 2500 stall really woke it up, 2 monthes later the tranny was toast! have a 200 4r now and relize a higher stall converter would be needed with a longer duration cam but prefer to stay closer to stock, maybe a few hundred over but not 3k rpm. biggest fear on cam is getting so big that I lose low end torque and need too low of a gear and too high of a stall. that fear and a good sales pitch is how I ended up with the cam I have!