I would use the Grant Gt, I have run several of them with no problems. I have a 714 (woody) on the 69 with a 1" billet spacer. BTW, those are nice lookin shoes..... 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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