What size Holley 4150 or similar for engine?

I would like to get a recomendation based on my engine and car. I'm pretty loss when it comes to Carbs so any help is greatly appreciated. By similar I'm open to Demon carbs and etc. I see that Demon has a carb looks kinda like a TQ wonder if that would be big enough.

Engine:

360 bored .60 over rebuilt with 10:2 actual compression KB hypertunic pistons, original crank turned .010"/.010", Eagle H rods. Factory windage tray. 2.02" heads with competition valve job and ported to flow 260 cfm j-heads. M1 Single Plane intake, port/gasket matched. Large 1 3/4" primary tube headers. Mopar Performance 292/509 cam installed at 108 intake centerline. Crane 1.6 roller rockers. Swirl port valves. Engine builder is known around Norwalk, OH his head work is his claim to fame.

Car:

69 Plymouth Barracuda all steel. 4.10 suregrip with 4-speed manual.