It's really a TYU. You can barely see the "T", but it's there.
V0929TYU
V - Flint V8 Engine Plant
09 - September
29 - Day
TYU - 1977 350/160 with manual transmission, 4-bbl carb (RPO LS9) 1/2 and 3/4 ton pickups
C7U118513 is the VIN
C - Chevy truck division
7 - 1977
U - Lordstown Assembly plant
118513 - Production sequence number that started at 100001. Yours is the 18,513rd truck produced at the Lordstown, Ohio Plant
Ed