4/6 or 3.5/5

[white71chevy]

ill start off with a little info on my truck its a 71 chevy c10 coil springs long bed with a small block. Now im wanting to lower my truck but im not sure how low i will be able to go i know the 4/6 is as low as i can go with out a c-notch. so i was thinking about that one but i have long tube headers on it and was worried it would be to close to the ground if i went the low. so i measured to see how high it was right now its 9" from the ground so a 4" drop would put it at 5" is that to low for a daily driver. if so would the 3.5/5 be a good one to go to. i saw 68stepbed's truck and thinks it looks awesome that low but i was kinda wanting lower. also where i live the roads are all paved but its still out in the country. thanks for all the help.