Strong IRS for High Horsepower 63 Vette

I am in the process of building a very high performance engine for my 1963 Corvette. My engine builder expects to make approximately 700HP and 725 ft-lbs of torque (383 SBC, 6-71 Supercharger with EFI). I want to keep the production differential and IRS. I am told that a 1965 differential with proper performance modifications may stand up to this much torque if I don't get too carried away with tire size. I am trying to find a performance differential outfit that can supply the parts and performance modifications for a differntial and related IRS components for my combination and I would welcome any suggestions that anyone has as far as who to work with. Thanks in advance!

- Fred

I am in the process of building a very high performance engine for my 1963 Corvette. My engine builder expects to make approximately 700HP and 725 ft-lbs of torque (383 SBC, 6-71 Supercharger with EFI). I want to keep the production differential and IRS. I am told that a 1965 differential with proper performance modifications may stand up to this much torque if I don't get too carried away with tire size. I am trying to find a performance differential outfit that can supply the parts and performance modifications for a differntial and related IRS components for my combination and I would welcome any suggestions that anyone has as far as who to work with. Thanks in advance!

- Fred

Fred check out my website and e-mail me with any questions for a set up for your 63. My car runs [email protected] on street tires and stock type IRS.