Good question. Prices range from under $1000 to over $3000. Hooked to the price is your ability. Do you have a shop with proper tools? Can you weld? Some front suspensions are bolt in and some weld in. If you are a good fabricator then the Weld It series would be a good choice.
sounds like you need to contact a manufacturer of mustII ifs kits
unless you just want a manufacturer to contact. in that case i have a fatman mustII under my 58 truk
brent is the owner/designer/tech support he also answers the phone half the time