I built a 535, 4.5 stroke, 4.350 bore. It made a ton of torque with 906 ported heads. It can be built into a great street motor because you can shift at 5400 or so and maybe less for best performance. I was shifting at 5700 with a 590 cam and I may have been over revving it. The nice thing about that many cubes is the ability of running a very tight converter and a low (3.23?) rear gear and it will still fly. The key to making it live is keep the revs way down and be conservative on the tune. They also make great bracket motors if you want a very low rpm reliable deal. I believe the torque peak using the McFarland formula would be about 3900 rpm. This is not a motor to push over 650 hp, or big port heads.