those look to be the proper bolt, but need a lock washer. here is a link to summit(arp bolts,& pretty cheap) http://store.summitracing.com/partdetail.asp?part=10047 you should also be able to get them in a Dorman @ a local auto parts . the threads dont come all the wat to the top in the flywheel(holes are counterdrilled).....crazyL 
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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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