you'll end up making the engine sit higher for sure, measure from the work top to the bottom of the cradle, i'd reckon on about an inch with thos pics, will effect oil pickup a tad i'd think.
i remember a discussion on xrtwo.com and compared the ka and puma against bc boxes and showed how the non bc boxes tilted the engines at some degree.
prob won't cause any issue really though, just engine will sit higher due to having to re-triangulate with respect to cradle and gearbox.