A rather inebriated looking K24A showed up this morning
But it has the RBB markings on the head which is what matters - meaning it is the "full fat" version with 3-lobe VTEC and ~200hp. There is a similar looking version with 160hp and only 2 cam lobes so you have to be careful!
Hopefully get that mounted up onto an engine stand at some point and take a closer look inside but so far so good. For peace of mind i'm going to give it a compression test and have a peek into the cylinders with a scope before going any further.