Had a sled for a while that the pan would start hopping around 150'. It would wreck trucks. It got sold thank god. It was one of them brush pull sleds.
I have 656 with a turbo that does alright. Also pull a couple 856's and when the trans gets fixed the 1456 with a Holset H1C on it. We are limited by the dyno so gotta get creative when making power.
DS79