Lampy from Ozdat got Les Collins to build him a 270-280hp 2L L18 series with Ka24de head and billet crank.
Dpent about 8-10k less than the OS Giken conversion. The KA head uses very simple mods along with a toyota 18RG crank chain cog and modded L series tensioners.
That OS giken figure could be made with carbs using an untouched KA24de head with wolf cams, headers and slightly prepped L20b bottom end (prepped rods, KA pistons, timing chain, custom sump) at 8000rpm.
On another hand those not after big hp but good fun. The local lads here in Japan love their 310 sunnys for daily tight roads in constant mountain terrain but prefer a punchy A15 as its supposedly very noticeable compared to bigger heavier engines. They mainly drift their Sunnys with the risk of going off down mountain sides to their graves so I will take their choices as logical. However most of these fellas weigh in at 50-60kg compared to me who is trim at 82kg or the extra L series weight :)
http://ozdat.com/forum/download/file.php?id=27343&mode=view