looking for recommendations

[pkj]

i have 68 long fleet. after looking and reading many of your threads i have decided to go with a 4/6 drop. i am looking for a better than stock ride. what springs are suitable along with shocks and drop kit. will i have drive shaft problems? i will use a set of 20 inch 07 Tahoe wheels and tires. i don't like spacers. what about wheel adapters to correct the off-set and cure the center bore? where can i find these or other suggestions. i would also like to upgrade brakes to power but leave drum/drum. go with used booster or new? where is a reasonable place for drums and wheel cylinders. to extend time on the 307 what can be added to the fuel to save the valve seats? has 3 on tree has anybody upgraded to newer type 5 speed overdrive standard trans and what is involved. truck must remain stick! looking for some of your creative ideas and suggestions. thanks