Dam that's too bad. Does sound like it's coming from internals to me. Ya run it without the torque converter connected first and like AG says check the balancer and crank pulley.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 9.95@134 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
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