Changing back tire on lowered truck?

[newbe351]

Due to a series of events, I have fairly steep wedges on the rear leafs of my 66 GMC. I want to install ECE lowering springs and will have to relocate the perches to correct the pinion angle (too far out to correct with shims). I will also need spacers to correct a back-spacing issue with my new rims. The 275/55/17’s will have a very snug fit in the wheel well once it's all said and done. With the tire crammed up into the wheel well and with the additional spacer width, I don't think that I have enough room to be able to pull the rims off of the lug bolts to remove them without them wedging against the fender well. With the relocated perches, I will not be able to go back to my original springs if things don't work out (without a bunch of additional time and money). Will a high-lift bumper jack get the wheel well up enough that I can get the tire out of there to change it (using axle jack now)?

Anyone else have an issue with this? If so, how did you correct it?

Thanks