Put the tallest and widest tire you can fit on the car, I'm sure the traction down there is marginal most of the time, epsecially on the streets, maybe not I would start out with a bias ply tire and sort the car out and then, maybe, try a radial slick of the same size. I have found that the radial tires will be faster and quicker here in the U.S. on good tracks, the bias ply tires work better(easier to drive the car off of the starting line ) on the marginal to bad tracks up here As far as rear suspensions I like use ladder bars, I have not yet owned a car with a four link set up in it, I have help a freind who had one on a 1963 Chevy 11 shoe box with a 586 HP SB 383 SB stroker motor with big (15x33x15) rear tires, we never did get it where it work excellent As far as the three ladder bar cars I have owned and driven, none of them work bad