I have a spare Neo sitting in my shed, and 2 RB30 blocks. I'm going to put one Neo head on an unopened block and see how it goes. I'll also slowly rebuild the other 30 and just wait for the first one to go pop.
RB25/30 Neo, Hypergear SS2, External gate, 6Boost, Greddy FFP, X-Spurt 1000cc injectors, Adaptronic, E85.
That's the general plan