With enough creativity and enginuity anything can be transformed into a crawler...but I wouldn't suggest it. You'd have to convert it to electric to get any sort of crawling performance out of it. That 4.6 is an awesome engine, I've got one in my AE MGT, but it's not a 55 turn lathe motor, which is what you want for crawling. Like I said, anything can be made into a crawler, but converting a Savage would take a lot of time, and most likely a lot more money than would be spent buying a "normal" vehicle to base it off of. There is a ton of room for customization on top of Clodbuster or TLT axles. Personally, I prefer the TLT, as they're cheaper, and much, much more realistic and fun.
You've probably seen some of the pics I've posted on this board of mine, it's based on a Tamiya TLT.