Well, as someone who ws going to do a CA swap (I even bought the engine...and would have done it if things had worked out) and is now building a KAT...I can tell you that there are tradeoffs with both, they are both excellent engines, and neither of them is perfect

The downfall of the CA is it's size...a place where the KA really shines. BUT, the CA revs better...which the KA doesnt do as well. They both are very sturdy iron block engines that have most parts readily available in the US...there is a bit more wiring work with the CA but nothing too hard. IMO, you cant go wrong with either choice

Oh, but for boosted duties, I would strongly consider rebuilding a KA with beefier parts. One last good thing about a built KA is that you know the engine is in good condition once you rebuild it...with a CA unless you rebuild it you never know what happened to it over in Japan
