on an 8" wide wheel, the normal offset should be about +35mm.
to achieve a wider track of 2" total (1" either side), then you could simply choose an offset of around +10mm. if you want 2" added to either side, then you could go with a negative offset like -15mm, or a combination of a low offset + spacer.
note, this is all in theory. such wheels are quite likely available in some brands/styles. in the rear, it is probably going to be 'ok' as far as being acceptable for geometry and reliability. presumably this is a bit of a show car, rather than a daily driver that you'd be putting thousands of miles on a month.
definitely not advisable to increase track at the front nearly as much. it will greatly 'adversely' affect steering/handling, and the tyres will most definitely rub on the wheel splash guards (inner arches) during turning.
some wheel manufacturers can drill the bolt holes in a custom fashion to suit your needs (ie: 5x98). or you may be happy to use wobble-bolts with a 5x100 wheel.
FWIW, i have ATP Tecnoforming wheels on my GT (19x8.5", ET35mm). these were drilled to 5x98mm with a 58.1mm centre bore for perfect fitment. top quality wheels, and lots of offsets available. could be an option for you.
Tecnoforming - Hi-Tech Wheels - Route in lega