New to the board... opinions on my setup ok, or just look...

[desertPOS]

Bought a '69 C20 Camper Edition a couple months ago, sold my '05 Silverado so this is now my daily driver. Truck has a GM crate 350 with 40k, and TH400 with unknown k ho52 rearend. First thing I did to this thing was new belts and hoses, HEI with new plugs/wires, new filters. Truck runs great and fires up pretty well, but seems to have a bit of a flat spot in initial acceleration and diesels a bit when I shut it off. Currently have the timing at 12*. Basically my plans for the truck are to daily drive it (bout 7 miles either way) and use it to tow my rock crawler out to the desert every so often. Plans for now are:

Install tow hitch, trailer wiring, trailer brake
Disc brakes in the front and new master cyl.
Add aftermarket tranny cooler & get a temp guage
Add a tach that'll work with HEI
Add a stereo so I'm not driving in silence

That'll about do it for now, but I'm sure I'll be doing more to it later (already thinking about getting a 383 stroker in there and rebuilt TH400 w/ shift kit). Seems like to get the disc brakes and keep it 8 lug, the only thing I can do is swap in the entire crossmember, suspension, brakes from a later model 3/4 ton. This right? Is it now possible to get some drop spindles that'll accept discs or something? There's got to be an easier way it seems like. Also, how can I tell if the tranny has the overdrive on it or not. I don't think it does, but also have no idea what to look for. Love the truck so far, and glad I found this board there is a ton of great info here...