235/60/15 on front of duster?

I bought a pair of custom 15 x8 Rallys with a 4.5 bs to fit on my 68 Barracuda, with KH brakes. After spending hours and hours to make it work,according to the suspension, I sent the wheels to a local shop and had them move the Spider to where it needed to be.
Then I installed a pair of sticky 245/50-15s and thought I was ready to go. As I was backing off the 4-post hoist and riding the brakes, I heard a noise and stopped. Come to find out the tire was rolling up the corner of the fender. So out came the tin-slips and solved that problem. Then, on the round the block run, I heard other noises so I fixed those with 1.03 T-bars. Then out on the hiway, those tires followed every wagon-rut in the road. I got some tools and on the hiway, played with the toe-in and got it as good as it could be.
About a month or two later, those stickys were bald, right across the tread very nicely. I replaced them with 235/60-14s and all my problems were solved except
I had to slow down in the turns a tad,lol.
The 14s were a tad taller than the 15s, about 25.1, to 24.3(about the same as factory tires were). She's been wearing 235s ever since.
The thing about 235s on the front and 295s with 10x2 drums on the back is, with no Proportioning, man does that beast scrub speed, when I throw out the anchor.