Is that the colour they called "Root Beer"?
I had not realised until recently that Jag was as big a deal in the US as it apparently was. There was an article in a 1978 or '79 edition of BMX Action comparing the "Mag Jag" with the "Team" model. I think they bent the Ashtabula stem [not unusual] on the Mag Jag but were, overall, impressed with both, particularly the Team.
You have replaced the weaker Ashtabula stem & cranks with the good stuff & the bike liiks great.