Yeah, but if you put them inboard too much the car will not look right. You probably do need a 3 in spacer to make it look right. If you don't want to do it this way, or put in a rear axle that is wider and then spacer the front wheels out, you should probably consider a different option. Placing the wheel inboard of stock will likely cause it to have interference with the frame or suspension when it is turned or hits a bump. There is another option for the front suspension, but I don't think you'll like it: Custom fab front control arms to place the suspension out enough to compensate. At any rate, the further from centered you put the wheel bearings in relation to the wheels, the more stress you place on them due to uneven loading. So, even with the 3 in spacer it may cause you to eat wheel bearings. I believe you wish to drive this car and not just make it a show queen, so it may be advisable to consider another option.
I will also add this from my own experience. I use a 16x8 in wheel with 4 in backspacing and a 245 50 16 front tire. It rubs a little on the top of the fender and also hits the plastic wheel when turned full lock. I had to trim the metal inner fender and I also rolled the lip of the outer fender for a few inches, then tugged it out by hand another 1/8-1/4 of an inch. I blended it all together with Bondo and you can't tell it was done. I still need to trim the stainless steel wheel house trim piece for the outside to match the lip, and figure out how to install it tight to the fender where the mounts are removed. This was my only way to stop the rubbing on the outside. For the inner rub, I have a F body steering box and will be installing the G body pitman arm on it soon. The thicker stops will keep it from hitting, but will also have the negative effect of making the turning circle larger. I don't like things that rub, rattle or scrape, so I tend to go to extremes to prevent it. You may already know some or all of this, but I post it here to help anyone else who happens to read this thread.