It's not cheap, but its worth it. My 67 has a 700R4. Runs 23-2400rpm @ 75-80mph with a 3.73 rear and 15mpg. I got a free tranny from my dads old 83 firebird and automatic crossmember from a junkyard, $35, you will also need a tv cable kit from Bowtie Overdrives, $130, a tranny cooling kit, about $50, a converter lock up kit, $75, I had to shorten my driveshaft, $15, and one case of beer, $18. Unfortunately my tranny blew after 6,000 miles. Most likely due to not purchasing Bowtie Overdrives TV cable kit. I am now looking at a local rebuild shop...$900 for tranny, and I WILL be getting the BTO kit.
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