That will not feel anything like a speedball IMO. Coke and opiate of choice (really supposed to be heroin) = speedball. I find that mixing meth and opiates just cancels out the effects of each other. Areal speedball is called that because of the rush, the coke and H hit you like a freight train rush of all rushed you just can not even imagine. Then you are left with just a heroin high and no comedown.
All that being said, this shit is insanely addictive and can be a very fine line between a good rush and death. Please exercise extreme caution, meth and opiates just do not mix IMO. So not really worth the risk if you ask me. Just my 2 cents.
edit: oh shit you are in Gainesville, is there meth in Gainesville now?? WTF. lol