Thought I'd drop my two cents worth in....
The 7K flywheel and clutch will not fit in a K bell housing, trust me I tried every avenue and it just wont happen, unless you remove metal from the inside of the box, and after that you wont have any adjustment, because the throw out bearing rests on the pressure plate. You must use the 4k clutch/flywheel
Also, I don't know if this will be the same for KE70 as it was for my 30, but the heater outlet pipes are smaller on the car than on the engine, and mine is carb'd, so there is f@$k all room for fitting up heater lines, which might not matter to some, but it is annoying.
Put it this way, its not a bolt in like some would have you believe, and 7K engines are easily obtained, but shop around, as I paid way too much for mine, in hindsight.