Bought me a 67, now have some questions

[randomhero472]

i bought matt67350's 67 swb stepside thursday night, 350/700r4 w/power steering/disk brakes. I got it home and have been working on it some today.. have some questions, how far can the rear be lowered before i need to relocate the shocks and use a different size track bar, i was also thinking of going w/the classic performer 4" heavy duty rear springs, i'll do some light towing w/the truck, anyone have feedback on those springs? the second question is whats the best/most cost effective way to relocate the gas tank, i saw kenny's truck has a relocate kit, he's only 2 hours from my house.. but does that use a blazer fuel cell, and if so does it hang down very far in the rear? also i'll be lowering the front 2-3", do lowering coils ride very nice on these trucks? thats all i can think of for now... your input is appreciated
pics http://pg.photos.yahoo.com/ph/matt67...r=52d7&.src=ph

also, if anyone has a pic w/a 3"-4" drop i would really appreciate it