SWEET! had a 65 short stepside project (lost it/stuck the EX with it during a divorce)
anyhow, get the catalogs from LMC truck, lots of great pic's and breakdowns of how it all bolts together
IIRC an El Camino steering column will fit it
AND, you have the old suicide single master cyl. If you want to stick to the stock brakes (4 whl drum) the master cyl for a 1971 chevy is a dual res, non power brake and will bolt right up, you'll just have to run your own lines to split the system, the difference on mine was night and day. you might run into clearance problems if you try to add power brakes, or need an expensive smaller aftermarket booster. I never got that far, but my plan at the time was to run the hydroboost off a 6.2 diesel blazer (DON'T use the one off a pickup, too powerful. use the blazer one!!!)
check the front fenders when you get started, there is a reinforcement panel on the inside, behind the tires. it's not sealed, fills up with dirt/mud/salt, and rusts from the inside out. patch panels are $40 or 50, not much at all.
another one, the 1960 had the 4 headlight grill, it is hard to find but looks awesome if you swap it onto the truck
good luck, looks like it's a perfect project truck in great shape, and it's an easy one to find parts for with a little searching. if you're anywhere near Colorado, there's a salvage yard about 60 miles NE of Denver with a fantastic bunch of old iron in it, I have the info somewhere.
Guess I never outgrew playing in sandboxes,
I'm in an ongoing love/hate relationship with the truck that owns me, happily enabled by my girlfriend
99 F350 CC DRW 4x4 PSD 6spd work in constant progress
Hypertech, 8" lift, Kelderman rear air ride, 4" exh, zoodad, tube grill, push bar, Dynatrak freespin w/ crossover steering, short throw shifter, coolant filter, AFE stg II, HPX, Fuel pressure gauge, 05 eagle eye headlights, LED tailights, cab and fender, rear line of fire LED'S, Bypass oil filter, FASS fuel kit, regulated return, water/meth injection, Southbend clutch, NEXT- upgrade CAC, Injectors, Turbo, Better chip, and a 22.5 10 lug conversion