front frame rail replacement help

have most of the front driver's side frame rail out except for where it attaches below the firewall next to the torque box. basically i just want to know what I have to drill out and cut to get it out. I can see the spot welds I need to drill out but my question really refers to the area the frame slips into. Please refer to my childish drawing below (particularly the area circled in green). Sorry for the crappy pic but it's all I could find on the internet. Thanks
View attachment 412697
 
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Have you already removed the driver side torque box? You have to remove that if you want to pull the frame rail out. To separate the frame rail from the floor support, there are something like 10-12 spotwelds on each side and some on the bottom. Just wire wheel the paint off and you will be able to see the spotwelds.