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Old school ‘furnace’ help

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So this thing is in my garage. Apparently someone had a guy go through it and hook up a new exhaust pipe about 7 or 8 years ago but no one used it since. It is plumbed to a residential natural gas line.
I have a background in automotive engineering, welding, structural steel, metal fabrication, industrial mechanical, etc. But I don’t typically work with natural gas. To me, it seems as if there are 3 gas outlets here. Two on the bottom are simply a nut welded to a pipe. No nozzle or orifice, nothing but that wavy plate welded on vertically. Then there’s a smaller hole on top which has a separate valve before the furnace (bottom two nuts) valve. Almost like that’s a pilot and the lower ones are the mains but it does not make sense to me that there’s just a wavy plate welded on to that bottom pipe. Nothing but two nuts.
It seems to me that if I light that pilot and then open the valve for the lower pipe, roughly 6” below the pilot flame, there’s going to be an accumulation of gas before it ignites.
This thing was made by a company in Edmonton in the 50’s or 60’s. Went out of business long ago. So I’d like some insight here. If I ran acetylene as a fuel in this setup, the thing would blow like a bomb by the time the pilot lit the main burner. But maybe natural gas is a different kettle of fish as they say.
Thoughts?
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