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1979 Schwinn Paramount Tandem Questions

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I haven't the slightest idea what one would mean if they said the campy derailleur would be at a wrong angle. I wonder if this is a misconception caused by the fact that the Shimano is a slant-parallelogram design-with the body parallel to the ground, while the Campy body would appear to be hanging, perpendicular to the ground. Campagnolo didn't make a slant-parallelogram derailleur until about '87. I suppose this reference to angle could be about how the hanger and jockey wheels might toe-in or toe-out. There are wedge-shaped washers to deal with this, but I don't see them being needed here. Of course, I am miles away from the reality of it---and inclined to be wrong now and then.
 
I think I will stick with the GT-300.
It’s not a bad derailleur.
Seems like it will be easier to part out a mid-seventies Schwinn Le Tour, than find the derailleur.
 
I haven't the slightest idea what one would mean if they said the campy derailleur would be at a wrong angle. I wonder if this is a misconception caused by the fact that the Shimano is a slant-parallelogram design-with the body parallel to the ground, while the Campy body would appear to be hanging, perpendicular to the ground. Campagnolo didn't make a slant-parallelogram derailleur until about '87. I suppose this reference to angle could be about how the hanger and jockey wheels might toe-in or toe-out. There are wedge-shaped washers to deal with this, but I don't see them being needed here. Of course, I am miles away from the reality of it---and inclined to be wrong now and then.
A Campy derailleur would be much less expensive and more serviceable, than the GT-300 Le Tour.
 
Serial number on tandems should be on the bottom right side of the head tube.
The number should start with two letters. The first being the month (A=Jan, B=Feb and so on). Second letter is for the year ( 1970=F, 1971=G and so on). Schwinn did not use I or O.

My tandem serial number is EM801728.
H-I-J-K-L-M
1-2-3-4-5-6
So should be 1977?
Ok, I’m very confused.
 
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I found an excellent condition Le Tour GT-300 rear derailleur, Sun Tour fingertip gear levers and a Campagnolo Record front derailleur.

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