Yeah that's the one I was looking at, thanks. Obviously there's a price difference, they have to make some money. Kameari Japan seems to be 30k yen cheaper, that's almost a twin idler
The Kameari Japan kit looks to be 218k yen, 30k cheaper than RHD japan. Datsun Spirit rods and pistons work out to $2830 + a head gasket....
http://www.kameariengineworks.co.jp/Catalogue-v3/catalogue-007-L3.pdf
I think it's the top left, kit number two @218,000