I have used Hurst Driveline Conversions and American Powertrain. Do yourself a favor and go with Hurst Driveline Conversions. They know their stuff. They are very professional and will give you a packet with all the instructions for the conversion. You will also get a receipt listing all the parts and cost of each part.
When I bought from American Powertrain I got the wrong parts for my conversion that they recommended. Also had to pay for return shipping and restocking fees.
Not trying to be a hater, but I lost alot of time and money. Never was able to get a receipt listing the parts I bought. So I can't say how much I payed for each item. Not a big deal but when things started getting fishy I wanted to know what they were charging me for.
This is just my experience