Re: ceramic header weld crack
JB Weld may not be rated high enough for a header repair right at the head. There is another product at the autoparts store right next to the JB Weld that is rated for 1300 degrees but the name fails me. It's in a small round plastic container/tub and packaged on a piece of cardboard like most tubes of goo. I've used it to repair a hole in the water pan on my smoker that sits right over the hot coals but never on a car.
Unfortunately, you're probably going to have to ugly them up a bit to prep the surface. You may be able to use a chainsaw sharpener bit in a Dremel to rough it up right along the crack so as not to completely wreck it.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled