I think you need to decide if the truck is going to be a daily driver for your son, as stated in your other post, or a chopped, dropped, bagged hotrod. You could go middle of the road with a mild hotrod using the 235 and update the brakes and suspension and have something unique, or you could follow the V8 crowd.
People used to build hotrods to be different. Now 'hotrodders' all follow the same code. I love V8s and I love hotrods, but I'm so tired of Cookie cutter-chromed out V8-Auto trans-digital dash-bucket seat-tiny steering wheel hotrods.
Yes, a 350 might be the most logical route, but hotrods aren't exactly logical.