@junkyardhero nailed it in post #2
I wouldn't put a 600 V-sec Holley on anything bigger than a 273. Ok wait;
I tuned one of those buggers lean and it made 40mpg Canadian on my near 200psi 367 , cruising 75= 1850 rpm, in overdrive, so there's that. But it sucked in standard tune on same engine.
If I had to, I guess I'd install the 600 on the barge. But honestly, a 600 only looks like it's a 4bbl. lol
If I already owned the 750 Eddy, I'd put that on either engine.
If that shot 650DP has center hung bowls on it, and nothing on it is broken, and it was made for a Mopar; I'll take it off your hands .........