Re: 1/4 mile
A 177 being a smaller roots blower should be building boost pretty fast. I would assume at 3500 rpm it is doing good making torque.
A slick might help, but you still run the issue of not transferring weight to the rear. I used to have lowering springs and I don't now.
Your radial is not much smaller than mine, they work just fine if you can tune the suspension which you can't right now.
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------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49
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