Offenhauser 5041 in later year ‘75 /6

It will fit but you will never feel the performance upgrade by simply slapping a bigger or more carbs to it. The exhaust is more important to upgrade than the intake side. For 75, you probably have a catalytic convertor that would be put to better use by being thrown in a ditch.

Ideally the engine should be built up but at the bare minimum the exhaust should be upgraded to really feel the benefits of increased intake capacity.