Any issues with swapping from 396 to 454 HO in 67-72 Trucks?

[kehstr]

With both of those motors being big blocks, you can unbolt the 396/402 and a 454 with drop right in it's place. The oil pan is the only thing i am not sure about, there are several different pans, some are deeper at the rear, and some are deeper all around, sorry can't help you with that.
What do you plan on using this truck for? is it going to just be a weekend driver? Race truck? Tow rig? Daily driver? These are all things you want to consider when building a motor for the truck.