That old intake is more or less an early 375-425 horse GM intake copy. If I remember correctly a big cap HEI unit won't clear the end runner.
A good budget street intake. Similar to a Edelbrock Performer.
If you bore it, get a mid dome piston 9-10 to one compression. A mild cam, headers and a 780 vac secondary carb, you will have a torque monster.