The Morels are designed to be a direct replacement and use the OEM length for the hyd roller Gen 6 engines. Whether you use retro fits or drop ins the pushrod length will be the same.

Thanks Chris (CSTRAUB), Saves me from digging out my measuring tools. If the original statement is taken at face value, no change in the pushrod length is necessary. If you do wish to validate your choice in the custom length rods, the mock-up plan (as recommended by Jeff1000) is good. However, don't forget to use these when using the rod length checkers. Don't want to colapse the lifter beyond your lash value.
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Thanks Chris, I'm familiar with all the above advice. Your quote is what I was referring to. Thanks for the responses.