Sean already said it!

The biggest and best was always L34 though. It was used twice, once for the HK GTS327 and again in LH Torana. L34 only ever made it into 1 or 2 HK's before GMH decided to create a separate model for the GTS327. Before that it was always going to simply be a GTS (0737) with L34 option. The V8 HK GTS (307) is option L30 on an 0737 GTS. With L30 on GTS you got 307, Saginaw, 10 bolt, 6" rims, radius rods etc. Option L34 got you the 327, twin exhaust and the big tank plus the L30 bits (but as before this got changed prior to release to a separate model). We all know what L34 was on the LH.