Please stick to the originality of car. if its faded, then it doesnt matter if body and evrything intact.
as for head repair, get a good mechanic. Finding an Economical one is not suggested infact find a best mechanic. A good and proper mechanic will charge some extra from normal mechanics and it will result in long lasting performance of your engine.
Charades came with 12 & 13 inch tire sizes. Go for the ones mentioned in the manuals and put some branded ones like yokohama, bridgstone or dunlop.
What do u mean by bear speed upto 160kms....? please specify.
do Post some pics of ur car which will also help us understand the car condition.
you can take ur car to jameel autoes near khudad colony and contact Mr. Irshad 0300-2237538 and get it diagnosed and estimation.