10 grand for tilt and AC is a lot but you have to consider it's a LOT of work to install factory AC into a non AC early 2nd gen TA with the factory correct parts. AND those parts will not be cheap. The engine's gotta come out. Firewall has to be cut. Need to remove buckets and console for access to the dash which has to be almost completely disassembled, radio, glovebox, gauges etc all need to be out of the way. As for parts you need factory suitcase, compressor, condenser, plumbing, crank pulley, wiring harness, brackets, dipstick, cowl fresh air trap door, belt, heater hoses, and a couple electrical bits under hood. Inside you'll need a heat/AC box, plenum, AC heater core, ducts, glove box door, steering column panel, AC kick panels, AC control panel, vacuum lines and diaphragm cans, heat/AC door cable, speaker bracket, firewall insulation, and the early correct gauge panel with the raised lips & small trim rings.
Vintage Air type modern system would be the way I'd go. Less cost for a complete system and less install cost. PLUS it can be converted back more easily if someone wants factory correct non AC car.
The tilt can be swapped out fairly easily. Ask your buddy with the junkyards to look up the 70 tilt column on the Hollander exchange. I believe the 1" splined shaft columns were used till around 77 before they switched to the double D columns. You'll need a new early 2nd gen rag joint. The electrical for the safety switch etc. is all the same.
http://gmtilt.com/
http://gmtiltsteeringcolumn.com/
I don't have an extra column but I do have some of the 70 AC interior bits if you decide to go the factory AC route.
Oh ya, I run 110 leaded on track, cut 50% with hi-test on the street. 68 # 16 heads on my 400.