This Rochester 4 Barrel Quadrajet comes with an electric choke, side fuel inlet and spread bore GM style base/flange, this means smaller primary barrels and larger secondaries.
Replaces Holley Carburetors used on some 7.4 / 454 Volvo-Penta marine engine applications.
It will accept your double cable throttle linkage arm without any modifications, just transfer this arm to your new carburetor will also accept your original flame arrestor.
Going back to the GM Quadrajet with Single fuel feed, means better fuel economy and reliability.
Forget about hard to tune Holley carburetors with expensive parts to replace