I had a 267 prasienne that wouldn't spin the tires if it's life depended on it. All of a sudden it would smoke the tires, a few days later I was putting in a convertor. Seems since the old one was smoked it would stall up. You might want to look into that.
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82 Mercury Capri 302.
Comp. Cams
Tremec 3550
3.73's
12.8@106 N/A
Kevin's Capri