Close - except that's a Porsche 935.
Here's what a Gr.5 Celica looks like:
http://www.racing65.com/greatracingcars/celica1.html
Tamiya make some very nice models of it in 1/10, 1/20, 1/24.
Ebbro make a nice 1/43 model of it.
Even Tomy did one in 1/64.
Try this one for a Japanese racing Celica liftback from 1973...
http://members.iinet.net.au/~stepho/motortrend11.jpg
Note the flares, the liftback body but the short, aero nose.
No V8 though, it had a turbo charged 4 cylinder (1600 cc 2T-G ?)
http://members.iinet.net.au/~stepho/ex-1-c.jpg
- Stepho