180B come with L18, there's also version called 160B which come with L16. LHD-version model is PL610 and lovely hardtop version KPL610. I've got couple of those Hardtops( actually I have keep them all), two of them SSS versions. RHD vesions miss that L from their model name. That p represents L-series 4-cyl engine(L-engined 1200 is PB110). There's also 6-cylinder models, G610 KG610 called Bluebird-U 2000GT which has longer nose to make room for longer engine and keeping 50/50 weight ratio. 810 models with sixes were sold is US under Maxima name, though. That G represents L-series 6-cylinder as my C110 Skyline 240K-GT hardtop is KHLGC110.

Nissan mixes and matches their parts hardly in 70's, most models can have any engine from factory, for sixes noses are little longer and most middle-size models can also have either IRS or rigid rear axle.

And yes I love Datsun J-edged design, especially Hardtops.