Alot of folk ask this question , you could use the search function on this forum to get heaps of tips and pointers on buying a ta22 ..
In a nutshell - mechanically - check for rattling timing chains -this is a obvious old 2t problem , worn brake lines etc is another of the cars old ..
rust rise - look around the windows , in the lip of the bonnet , behind the rear wheel arch , around the taillights , in the doors and front fenders ..
Also under the car - before the rear wheels - in the sill ..
For more details - the SEARCH function is your friend ..