Yeah I am not set on the 268 or anything for that matter, I dont even have the motor but I would like to run low 10s eventually and I think that the hemi would be more reliable at that level.
man I'll be adding twin turbos to my build. I currently have a spartan cam from inertia and heads from them as well. It will be backed up by a 727 trans. And about a 3000 stall converter. I'm shooting for low 10's but I have a feeling it will end up in the 9's and that will be on 5-7 psi. And should get really great fuel economy. Be easy to drive around town and blow the doors off just about anything I want. I think your goal of low 10's is doable. But it will require a really light car or a perfect setup. In order to get there with 500 at the flywheel. You could always add a bottle to get you as fast as you want just don't go over a 150 shot on the stock motor.
sorry about the tangent. Low 10's should be fairly easy with a hemi. And very stretable. Good luck can't wait to see it.