Slant header ID?

When I took my newly assembled engine to my buddy's house for an initial run-in, we used his long-tube headers on the stand. They fit fine. Note that his headers sweep to the back faster, have different bends, and the collectors point in different directions.

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When I started doing the final assembly on the block to go back in the truck I went to hook up my long-tube headers and they don't fit. This is in a truck so it has a rear sump. The front tubes hit on the driver engine mount and the oil pan, and not by just a little. Both sets of tubes sweep more downward, and the collectors are basically parallel. Also, the collectors are jammed together so plumbing the exhaust pipes would be a challenge.

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The buddy with the run stand and the guy I got my headers from are both veterans of the slant world, and both said their headers were from Clifford. I can't find any markings on mine anywhere. Does anybody know who made these two sets of headers, and what they are supposed to fit?

I'm solving this situation on a temporary basis by using a set of Clifford Shorties, but I'd like to know what I can do with the long tubes moving forward.

TIA - enquiring minds want to know!