Holley Help Needed

If I'm right your carb is set up 63 primary and 70 or plate #39 secondary with an 8.5 valve.

If you have to go 4 sizes bigger or smaller you have the wrong carb.

I would try 65 primary jets and plate #11 or 73's in the secondary.

Like others have mentioned you should do the meter block conversion, jets are cheaper.