The will probably fit, I think the only difference is the venturi diameter. The rods and jets from the 600 with be VERY lean in the 750 due to the weaker vacuum signal to the discharge nozzles. Primary rods are $11 at my local parts store. I don't know the cost of the secondaries. The jets are probably $3-$8 per set. I tried ordering metering rods for my Qjet and got them for a Carter, that is why I know the price. The Edelbrock 600 is a Carter carb, the 750 could be a Carter or a Quadrajet. I'm assuming you mean your 750 is a Carter.