Cope CRT-22X accumulator

Hi guys

I just finished up my 904 build with a CRT-22X valve body and wanted to know if you must use a blocker rod in the accumulator or can you still use the spring?
The instructions that came with are clear as it mentioned you go do either with the - 2X.
Its a street car so wanted to keep the shifts somewhat cushioned if possible, if not, I'll pull the pan and fit a blocker rod if it must be used.

Thank