OK time to weigh in...
The terminal block shown is legal but not the best to use for your purpose. As philso has detailed, this system requires keeper blocks and a DIN rail for correct use. They are hard to terminate if you can't see into the block and best wiring practice must be followed or the wires will be pushed out of the block as you tighten the retaining hardware.
As to the XT 60, these may be legal at this point but teams should remember that these are "rated" for 60 amps but not UL listed for that current. What I have been able to find in my research is that the connector UL certification is for the VW-1 vertical flame test, that is not an electrical specification.
The Power Pole connector is UL rated for current. That means that a 35 amp connector can pass 35 amps for 24 hours without exceeding a specified maximum temperature. They pass 130 amps without significant loss and do not heat during match or practice.
Several retail outlets have crimpers for under $50. One that I do business with is High Sierra Communications products. They are selling a simple crimper for $5 and ratchet crimper with interchangeable jaws for $35. (I own the ratchet with interchangeable jaws for coax and other terminals.) I bought two for WildStang this year when they were on sale. There is really no excuse to not use these. The jaws will terminate SB50 terminals and 15, 30 and 45 amp terminals. If you feel that even the crimp is not reliable enough, add a little solder, like we do. Yes it is a little belt and suspenders but we lost to Beatty because a crimp pulled apart a long time ago and we will never let that happen again.
http://www.hamcq.com/powerpoles-tools/powerpole-tools/