Re: lifting dana44
NEVER install lift blocks in the front! It is extremely dangerous! It's even marginal to have stacked lift blocks in the rear, but is still legal in some states.
Your question, however, cannot really be answered untill we know how much lift you want. For 1-2", an add-a-leaf is the cheapest route. For 3-4" the cheapest would be RamchargerCentral.com's shackles and brackets. Beyond that, you will have to buy new springs. They usually run about $300-$350 for a pair. Remember, anything over 4" will require extra work/parts, ie: brake lines, steering correction, driveshafts, ect...
About the studs in the front diff. If you install thicker spring packs, and the studs are too short, remove the old studs. If you can find proper grade 8 studs, use them, otherwise buy grade 8 bolts. Grade 8 bolts are what most lift kits come with to replace the studs.