Carb choice

So right now I have a 73' 225 that beyond an Offy intake and eddy 500cfm is totally stock and tired with 160k without being opened. Over the winter I'm going to pull the engine and do a long rod conversion, a cam, some headwork, and add a header.

Right now the car isn't a big fan of the eddy, it runs okay on the 2bbl but when I had it rocking the linkage to run all 4 barrels it had a horrible bog when nailing the throttle, even managed to kill it on the line during a test & tune!

So my question is, when I put this thing back together I want to do either a Holley vac secondary OR would a 500cfm Holley 2300 2bbl work better? Car is used mostly on the street but 20.1 in the quarter is kinda miserable!