s-10 leafs and HO head questions....

Well i have a couple totally different questions i need cleared up...

First, I have AAL in the back of my 87 XJ and a 2" shackle in the back of my jeep. Im not very satisfied with the ride. The AAL is full length rough country. I want to build my own bastard pack to get about 4"-5" inches of lift. How much lift will i get with a s-10 main leaf mated to my stock leaf pack with no AAL??? How does this ride??

Second, I have a non HO (87) straight 6 in the XJ. Can i put a HO head on this engine and get some more power? Is it a straight swap? If not whats involved and will there be a noticable difference??

Thanks for any help with these 2

youll need several leaves from the s10 pack to achieve that lift, probably the top 3