If it really is a mud play thing then just this once I say,,,lock it all out, no vac advance. Have it timed at 18, mark dist to block or use a stop. Then time it at 35, mark dist or block. Set it on kill for the mud blast and back to stun for the way back to home or the trailer,,,trailer that is were you find most of these ford play things
ok fly the mail boys
Hmm maybe there is a way change timing with variable voltage on this fancy blue oval distributor rather than twisting it.