C30 Dump needs to pull too.

[57Suburb]

I've got a 72 C30 with a dump that currently rocks a 350/th400. Nothing really wrong with the set up as it currently sits. Runs good, but a little under powered when I have a good load on. But, I want more!!! I need to be able to hook on a 20' heavy duty trailer loaded with an 873 Bobcat and up to 3000lbs worth of added payload (10k to 11k) total. I currently pull this set up around with a 93 3500 dually equipped with a 454 auto. It does pretty well, so I had my mind set on doing this motor swap into the 72, which includes swapping motor mounts and everything that goes along with it.

But, I've been thinking about an alternative of building a high torque 383 to keep everything the same, and making it a simpler swap. Seems like I can get the same torque and hp numbers as the 454, but will I be happy with it in the long run doing the kind of work I'm wanting to do? Anybody doing this heavy work with their trucks? And for all those doing the LS and diesel thing, I know they work well, just trying to keep the swap simple.