That's not exactly what the catalog specifies.
It's not until 1978.5 (effectively the 1979 model year) that the nomenclature of the frame material, geometry and groupset was used. The serial number will show the frame series. In other words, my 1978/79 736 shows as a 730 (531 frame, "racing" geometry) from the serial number, but as it was built with a 600 group- that makes it a 736.
The 1977 catalog shows a variety of Suntour combinations for the TX200-TX700 with Dura Ace stuff and Campagnolo NR at the very top end. You also get a good idea of what Trek was using in the 1978.5 catalog Suntour VX, Shimano 600, Campagnolo GS and Campagnolo NR.
More than likely, out of the items listed, the derailleurs may be original.
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*Recipient of the 2006 Time Magazine "Person Of The Year" Award*
Commence to jigglin’ huh?!?!
"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.