That you suspect the bottom end is not stock is going to make selecting heads very difficult, especially if it has unknown high compression pistons.
You also need to know what type cam, the lift and duration specs, and if it is solid or hydraulic.
Any small block heads will fit that were used with a carburetor manifold. But there are many different valve and chamber sizes, which needs to be matched to the pistons and cam for the correct compression ratio.
If you have any paper work on the engine it would be a huge help. Look specifically for a build sheet.
As for a carburetor, my suggestion would be none! Go with an aftermarket throttle body fuel injection. They are a little more expensive, and a little more installation, but it's going to be the only practical solution for a car that is not going to be driven on a daily basis.
If you do go with a carb, Quadrajet was my favorite, because I knew them and had all the jets and rods and springs to make one work. There were also Carters, Edelbrock, original Rochester's.
And so many Holleys... Absolutely detestable! Hard to tune, reputation for leaking gas, sold by the millions in the wrong application. They contain internal and external diaphragms which don't like ethanol! Leak internally and externally.
But no carburetor can be expected to work reliably sitting with ethanol in it. Period!
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