I jack on the pumpkin and K frame. If you put jacks at, or use a jack at the front of the side rails the front end tends to sag with an engine in it. I like to use cribbing unless I'm working on the wheels, brakes etc. View attachment 1716045289
By cribbing, do you mean those sets of 2x6s under the wheels? It looks like you alternated direction each layer and probably screwed them together, right?
