can't get the frame detached from the rear springs???

[valero]

how's it goin everyone!

so, I'm trying to pull the rear end off of my donor frame, but can't seem to get the bolts that good the springs to the frame loose...??. the frame has been powder coated, but I'm using an impact wrench and it's not even moving. should I come in from the inside of the frame and try to loosen the nut with some heat and a wrench with a breaker bar ?

I have to get this thing moved ASAP, so any quick advice would be helpful!

thanks!
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