Advice please. Will this situation hurt me professionally?

I am applying for federal employment. I very much would like to work as a federal employee. I am currently working for a private company in Northern Virginia. I have been here for 10 weeks and I will resign tomorrow. I am deciding between giving two weeks notice or giving my resignation and walking out immediately. This company is falsifying a range or certifications so that they can increase their business and meet the requirements of a federal contractor. The work conditions are unbearable: I am required to work at least 50 hours a week and I cannot take a one hour lunch break. I do not make that much money in this position, definitely not enought to justify the hours. Many weeks I am working 60 to 75 hours. I have been sick and feeling faint recently. This job is also hurting me professionally as I think I am not learning enough to build a better future. We are currently in the middle of a very tough period writing federal proposals that are due next week and the week after. I think if I walk out tomorrow the net impact on completing the proposals is moderate but not severe. My health and professionalism are compromised. If I just walk out will it have a negative impact on my federal employment applications? I am forced to engage in unethical activities to complete my work responsibilities, and each day that I remain there will further impact my health and happiness. So, do you advise walk out after resigning tomorrow give two week notice? If I stay for two weeks I will work 70 to 80 hours each week, and those hours contribute absolutely nothing positive to my career.