coil spring front

Coil over suspension will give you more room for some headers. I haven’t seen any posts about the Gerst suspension welds failing.

They're out there. This is supposedly from a B-body page. Not my post, haven't personally verified it but it seems legit. Also seems like a bad place to put a weld, so it makes sense too. QA1 has in fact redesigned that area too, so it shouldn't be an issue with the QA1 version of that suspension, just the Gerst.
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And yes, the header thing is true, but what headers are you going to run? Unless you plan to go significantly larger than the TTI or Doug's headers that are available that do fit with torsion bars there really isn't much of a point, and those headers will support some serious horsepower. For an engine swap application the header thing makes more sense, although there are also GIII headers out there to clear torsion bars. Yes, the Doug's and TTI's are expensive, but so is everything else worth having.

The only thing you really can't get any other way is a rack and pinion, and if that's a "must have" for you then a coilover conversion is really the only way to get there with streetable steering geometry. Personally I don't get it, especially with new steering boxes and the Borgeson power steering units out there. But that's just my opinion, and others are free to disagree. A rack and pinion is not a "must have" for me.

Pick your parts, spend your money. I'm just trying to put the information out there so people can make an informed decision about what it is that they're actually after when they write that big check to convert their suspension over. Just because it all came out of one box and bolts on does not mean that it's the best choice for every application.