Willard 500 settings.
If you have Modloader then the Vehicles.ide, Handling.cfg, Carcols.dat and Carmods.dat settings can 
be simply installed by copying this file in a folder inside ModLoader directory.
Replace the default line in Vehicles.ide with this one:
529, willard, willard, car, WILLARD, WILLARD, null, normal, 10, 0, 0, -1, 0.7, 0.7, 0

Replace the default line in Handling.cfg with this one:
WILLARD 1650.0 4100.0 1.7 0.0 0.0 0.0 70 0.64 0.84 0.54 4 160.0 27.2 150.0 F P 2.8 0.51 0 30.0 0.455 0.15 0.0 0.05 -0.14 0.5 0.3 0.17 0.54 19000 40000000 0 0 3 0

Remove the default line from car section of Carcols.dat and then add this line in car4 section of Carcols.dat:
willard, 31,31,1,25, 10,10,1,25, 25,25,1,25, 27,27,1,25, 75,75,1,25, 83,83,1,25, 116,116,1,25, 111,111,1,25

Replace the default line in Carmods.dat with this one:
willard, bnt_b_sc_p_m, bnt_b_sc_p_l, bnt_b_sc_m, bntl_b_ov, bntl_b_sq, exh_b_m, exh_b_t, exh_b_ts, nto_b_tw, rf_b_sc_r, spl_b_bar_m, spl_b_mar_m, spl_b_bbr_m, spl_b_bab_m, wg_l_b_ssk