We have been down this track just so often it's getting BORING!!!!!
The PJR cars of Glenn Seton & George Fury plus others ran 17 x 9 front and 17 x 10 rear with 240/625 front and 240/650 rear slicks.
For the uninformed these designations mean 240mm wide (bag to bag) same as in normal tyre sizing x 625 & 650mm diameter, that's overall static diameter.
The OPTIMUM tyre size is 245/45 x 16. This gives the largest footprint and is still within 10% of the original tyre size of 195/60 x 15 and the TEST (recommended) rim size for 245/45 x 16 is 8 inches, so my call is the wheels to have are 16 x 8 all round if possible.
My road wheels are 16 x 8 rear and 16 x 7 front using 225/50 rear and 205/55 front.
My track wheels are custom modified BBS Lorinzer wheels of 16 x 8 all round with 245/45 x 16 tyres.
For the strip (drags) I have a pair of Mickey Thompson ET Drag Radials 265/50 x 16 and the recommended wheel for these is also 8 inches wide.
Looking at DrJosh's pics, I'm suggesting the tyres on his wheels are about 225 wide, due to the excessive stretch on the side walls. Stretch like this on a road car does nothing more than expose the side walls to infinite amounts of damage from an infinite range of sources.
Make up your own mind, but staying within 10% of original, which is mandatory in NSW, any 17", 18" or bigger rim will use a narrower tyre and similarly down to original 15's.
JMHO