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 I have the ERA primary pipes on my slabside and they fit fine. Block is Dart SHP with 8.2" deck height (i.e. 289/302 spec). Heads are AFR 165. 
 However in my case I'm using ERA's undercar exhaust. So my primary collectors are slip-jointed to a J-shaped undercar headpipe leading to mufflers under the frame outriggers, and thence to tailpipes that hop over the rear axles, squeeze between my 215/70-15 tires and the frame, and out the back.
 
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