[thomas sheehan]

Jeff

Here's your answer....

See page 302/320 in the downloaded version of the 2013 rulebook.
It's in section 20, page 34 (General Regulations under Ignition).

"The use of any programmable multi-point rev limiter and/or a rateof-
acceleration rpm limiter, either by themselves (e.g., MSD 7561)
or integrated into the ignition system (e.g., MSD 7531), are
prohibited in NHRA competition."

These are the only two I see prohibited from msd.
7751 is not mentioned in the 2013 rulebook.