Yep, genuine HZ Sandman....

worth??? Let's break it down in parts.

yellow needle GTS dash.. Complete.. $1000
Black HZ GTS steering wheel........... $400
308 engine cond. unknown.............. $1000
M21 gearbox cond. unknown........... $400
quad headlight front....................... $300
salisbury diff ................................ $200
GTS rims x four............................. $400
HZ chassis and Sandman tags......... $1000 to $2000

I reckon a fair price is around the $3500 to $4500 for the car as is.

A lot of work to bring her back life and really only worth it if you have the skills yourself, a shed to do it in and the time to do it. Good luck with whatever you decide.