NO WAY srt headers in an A body

Oh yes, by the way mcat, the LX 6.1 manifolds won't fit in an abody. Sorry, just had to do that. lol

The Jeep 6.1 manifolds are a much better candidate, but I don't know if mods would be necessary, as there's usually not consistency among the various suspensions being used.

The main thing though is the LX version arch more outward toward (and into) the frame; the Jeep version goes more straight down, tucked more toward the block. I have a pair I bought for a 6.1 I want to put in my 'Tona and my car is all apart or I'd check the fit.

I will say, if you're using torsion bars, they will likely be dumping right above them and your exhaust pipes would have to make some abrupt turns. If the outer housing interferes with a stock manual steering box, you could likely modify the outer housing for clearance without modding into the port tubes themselves.

I will add also, I'm providing this input not from speculation but from owning a couple sets of LX and one set of Jeep manifolds.