A couple bits of info on the Tunnel Ram you may not know.
Vacuum secondary carbs require that the vacuum pods be connected, so that both secondary's open synchronized to each other. You don't want one wide open and one only half open.
Holley sells lids with a hose nipple, but they are rather expensive.
Allstate Carburation has them for about 1/2 of Holleys price.
HOLLEY VACUUM SECONDARY WITH BALANCE TUBES - Allstate Carburetor (allcarbs.com)
Allstate is a great source of parts.
You may find it easier and better to just drill and tap the center of your Quick Change lids to add a small hose nipple to each lid.
There was someone making the Holley lower housing with a hose nipple, passage intersects on the side close to the vacuum passage feed into the main body instead of putting it up on the lid, and I've read a link on how to add it there yourself.....I'll see if I can find it if you think you want to go that way for a more hidden hose install so it looks cleaner.
i think it was at the Race Fuel Systems forum somewhere.
racingfuelsystems - Racing Fuel Systems (tapatalk.com)
You're also likely to need lighter rate springs, which looks like you already know since you bought the quickchange lids.
i would guess either Long Yellow or Short Yellow.....maybe Purple and possibly even White.
The stock Plain(Silver) is too stiff, even in stock single 4 barrel form it won't be fully open until 5000+ rpm.....and you've got signal split between two carbs!!
Great looking Chevy, by the way!!!