I may be a little late chimming in....just joined the forum. The Picco/JLR.12 Evo3 is the stongest .12 engine hands down. No other .12 can beat it.
Not talking manufacturer claims, but X-Dyno proven.
My modded version will outrun about everything from the .20 TRX 3.3 on down, including my 21TM. I run a drag modded version by AB mods with the matching 2607 pipe in my Jato. It will dyno nearly 1.3HP, 40oz.in tork and keeps pulling beyond 50K rpm.
Here is a couple pics and short video just after breakin. Steel a lot of metal/metal pinch. Already hit 64 on my Bushnell Velocity.
The engine is probably good for 68-70 in a Jato, and it will do it in a hurry, even with the stock clutch. Much faster in a smaller car and much quicker with an adjustable clutch. My Jato is over 4lbs.