My thoughts as well.
Get a good Convertor, something like a Dynamic 9.5 custom built convertor.
An Edelbrock Air Gap intake also.
Ran a combo that was similar , 9.5 convertor, 3:91 gear in a 3500LB 4-door 1973 Valiant.
with 9"slicks with exhaust, it ran 12.50's.
