No, a Delta 88 is not a gbody but you might have more room to fit a wider rim than the gbodies.
If you are trying to fit the widest rim possible without sticking out of the whellwell you will have to do some mock ups. There are a couple of relatively inexpensive tools for this out there for doing tire and rim fitment.
I still think 10" on the front is going to be too wide even for your large car.On the rear it is possible it will fit.
You could also just buy a pair of the rims you think will fit and carefully slid them on the lugs just to get an idea of where they will sit in relationship to the whellwell. Without the proper tool it is really just trial and error and some educated guessing.
If you can find a local tire and rim store that will be patient enough to work with you they might let you try some different rims with different backspacings as long as they know they are going to end up selling you something.
If you are trying to fit the widest rim possible without sticking out of the whellwell you will have to do some mock ups. There are a couple of relatively inexpensive tools for this out there for doing tire and rim fitment.
I still think 10" on the front is going to be too wide even for your large car.On the rear it is possible it will fit.
You could also just buy a pair of the rims you think will fit and carefully slid them on the lugs just to get an idea of where they will sit in relationship to the whellwell. Without the proper tool it is really just trial and error and some educated guessing.
If you can find a local tire and rim store that will be patient enough to work with you they might let you try some different rims with different backspacings as long as they know they are going to end up selling you something.