ive a wagon same shape but total difrent engine box combo and im doin the suspension in the front of mine too and ive found sum mitsi delica rear springs for the front which im cutting down as theyre the same diameter but around 6kg spring rate atleast and im puttin ae92 uprated shocks in there with a small spacer to keep the insert captive, looking good though, id go for the 3sge engine swap as ive seen a carina wagon with it done and its f%#$king sweet, ive got a 1s crossmember , 1s sump , 1s engine mounts if u want for cheap for the cnversion helps a biggie if u got everything that fits that u dnt have to customise