New 408 stroker runs rough at idle

So it turns out the throttle plates weren’t centered properly in the bore causing them to have an excessive gap. Loosened the screws, and got the blades as flat as possible. Drilled the holes out to an eighth inch, and now at 600 rpms, the motor will die with both screws turned in. I did bump the initial timing up to 16 degrees, and installed the fattest advance stop bushing so it would be 34 total, and checked and it’s 34 right on the nose. It no longer seems to have the nasty hesitation when taking off, but one problem remains. The car runs rather hot, about 210 ish degrees even when going 60 mph on a flat road. But I’ll do another post for that.