good luck , what rearend gear ratio are you running? etc that & other thing's have to be looked at i had , a 69 coupe , grande with 4 v head's 4 - speed out of , a 70 mach & same rear end out of the70 it had a 2 v carb , but would burn rice all day you have to try different set up's to find out how your, ride works best .got a stock 00 gt now it's pretty good but am waiting , until warranty run's out , then look out . good luck mine is a street racer you , may want to talk to , the drag racing guy's . 66 is a great car though . bye
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