Opel Monza value?

hey guyes what is the aproximate value of a 20l 8vlve opel monza with 17'mag wheels (macrav)new tires? Plus 20l 16v superboss motor. i have a 1997 nissan double cab im selling ( R5400) an a guy wants to swop me his moza ( above) plus spare 20l motor plus R35000 for my backie .I would rather want the cash and not too sure the value of his car and motor. the car is in real good nick,has branch and good exhast??? your views would be preciated.... and i know its not a nissan

my opinion...

only take trade-in if you're a dealer, and you're sure you can cover your shortfall with the sale of the trade-in.

how badly you need the cash, how long you willing to wait to sell the opel?

so right dont need all that admin , i think ill pass on it. will leave me with too many maybes.....