slant six carter bbd to holley 2300

To change over to a Holley 2300 you need the following:

1) A Rochester 2GC to Holley 2300 adapter. Both Transdapt and Mr Gasket make one.
2) A Holley throttle adapter bracket for Mopars.
3) Cables from Lokar to hook everything up.
4) Optionally open the throttle bores in the manifold to match the carburetor gasket.

I don't think the Transdapt or Mr Gasket adapters are worth the money. Both have been reported to have vacuum leaks. It is not hard to fabricate your own adapter from 3/8" aluminum plate. And when done, you could actually do #4.