I bought a block from KB back in 2014. I found the best time to phone was around 2pm Pacific Time (US). But at least somebody answered the phone during regular California (Pacific US) work day hours. Lots of delays, but I did eventually get the block. Another racer near me received his block in 2015 about 16 months after ordering.

I haven't been in touch with KB this year.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1