Need a 4bbl Intake for my 66 barracuda 273 2bbl

I definitely wouldn't hack a 64-65 4 bbl intake to fit a 66+ small block. Those are rare (I finally bought one on ebay), whereas 66+ are everywhere. Indeed, I went the other way, counter-sinking the holes of a 66+ to fit my 65 273 and used flat-head bolts (conical bottom), but hard to get them tight (small allen head hole) and had an initial steam fix at the front. If hood clearance is tight, you can get drop-base air cleaners or an after-market chrome hood that goes to a duct and look cool.