wheel/tire questions...

[Baseball0684]

I am currently building my 73 2wd Blazer, and wasn't sure if the tire size I wanted would fit and also what backspacing on the wheels would be best. The truck is lowered 4/6.

I was planning on getting the american racing torque thrust 2 wheels, with 17x8's up front with 235/55 tires. I know that one will work, but wasn't sure on the backspacing.

On the back I wanted 18x10 with 305/45 tires. I think that would fit with correct backspacing, but not positive. So what are your thoughts on that?

Thanks, Brett