Factory AC for 68 Valiant.
I recently installed A/C in my 63 Belvedere. Vintage Air compact heat and air. Cooks you and Freezes you.
Can't beat the Sanden compressors. Just a thought for you. Cost was ruffly $1200-1400 total.
Never thought the day would come that I'd have air in my Hot Rod. Like you Southern Nevada it's a must.