Definitely not straight forward, i did a bit of a write up in the alternative engine discussion thread. For it being worth it, yes and no, its a great engine and reasonable power, very suited for my local roads and driving style, plus the sound from the throttles and in an ep70-80 it would be even better as more weight saving. However with the price of the 2zzge and K20 coming down and the lighter weight of the all alloy blocks you get more power and weight savings so i would be tempted to opt for one of them instead.