Enough room for 15x10 on a Demon?

Can anyone tell me if I can fit these without having to cut on my '72 Demon? I have been searching and searching and there is not much good stuff to be found for that weird bolt pattern.

http://www.summitracing.com/oh/parts/brw-997513440/overview/

Not sure if anyone have the experience but does the backspacing work with that wheel so it wont stick out the body etc?

Also, sadly they only made a 15x10 version of this wheel in 5x4 BP, so I was planning to paint one of the rally wheels for the front so at least the color match. 15x10 seems a little extreme for the front....

Any suggestions are appreciated. I am aiming for 295/60 wheel in the rear and maybe 225 in the front. Should I go with 15x10 or could I also use 15x8 for a 295/60 tire?

Thank you for the help!