315/35/17 tires up front

[sr73bu]

Hey guys- I'm getting my car ready for the RTTS event in April and I looking into having my 17x9 soft 8's widened to fit 315/35/17 tires on all four corners. I've got a tire (of that size) lying around and it looks like its going to fit up front...73-77 chevelles/lagunas have what look like fender flares from the factory and can swallow huge tires.

My question is: is this really a benefit up front? I've heard it effects turning radius, scrubs speed out of the corners (not like i'm going to be any good at driving anyway)... I have a few weeks to make a decision, I just want to know any opinions on running such a wide tire up front. My thought is: wider is better, but IS there a too wide?

the alternative is 285/40/17 on all four corners without widening the wheels. or just widening the rears and running 315/17/35 on the back only.

I have a tight budget, so I've be focusing on the basics: lower car, lighten car, widest wheels/tires possible...

Besides RTTS (2 mile roadcourse), i'm most likely going to be doing autocross.

Any and All advice is greatly appreciated!

Thanks in advance,

Sean