castor blocks are the "u" shape bits that the steering arms attach to. Kit ones are 0 degree, but 5 degree in most cases make the steering more direct, but you should try both and see which you prefer on your track.
Tyres on astro are Schumacher yellow mini spikes rear and usually Schumacher stagger / cut stagger on the front (cut staggers give a bit more steering)
If it's wet Ballistic Buggy greens are what most use, but Schumacher silvers may also work
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