This is just a bad idea, that is a lot of H to mix with Southen Comfort man. This sounds to me like you are trying to overdose, do not mix that much heroin with whiskey.
Every time ive ever mixed heroin or any other opiates with alcohol ive just got a really bad headache and felt sick and ive been a heavy opiate user. Its a really bad combo IMO.
If your trying to OD maybe write a thread in the dark side and get some help.
OP we don't know how strong your H is and can't answer this question except to say that it is extremely dangerous, especially when mixed with another CNS depressant such as alcohol. Please don't make any more threads like this asking if you will OD.
Feel free to PM me if you have any questions and concerns.