on my LD4B intake I did that, I drilled/tapped to next size stud size and got studs that where larger on one end and normal carb stud size on the other.

or you can go to the next size bolt/stud... but you want to check carb flange to see if they will need inlarged.

for a long time on my LD4B the outer carb stud holes were striped and I used the inside holes to bolt the edelbrock carb on and even used a squarebore to spredbore adaptor in the inside holes on intake flange