What about changing to 3:55's??
Going to open driveline means you have to change/modify transmission, rear axle, springs, driveshaft.
Are there NOS 3:55s available or would I be looking to get them out of a similarly aged GM passenger car?
I'm a very novice mechanic and while I'm pretty comfortable under the hood the transmission/driveline and re-end are all pretty much a mystery to me.