any thoughts on air bag kits

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hey ya'll, I am new to the site and found alot of good info here. putting a big block in my 68 stepside and while it is apart I am thinking of bagging it. has anyone used this kit from air bag it? http://www.airbagit.com/v/vspfiles/p...Rods_PAGE.html
wanted something simple and complete but dont want to use junk....any feed back would help!

right now the truck is lowered and it had a small block I bought it that way 12 yrs ago so i dont know what springs are in it but they are not cut or heated and it seemed to be a 4" front 6" rear drop. I worried that the bb will make the ft too low. It occasionally bottomed out b4. (the reason why I was thinking of bagging it.) Again any feed back would be appreciated! few pics of where im at below.
PS
Had a hard time finding bbc mounts but found some here in texas!
http://www.americanclassic.com/Googl...MM-59-1968.htm