hi, and welcome to the forum. the 750 baseplate has 1-11/16 bores as does the 650, the 600 baseplate has smaller bores and i'm pretty sure the 750 baseplate will not work. i'm modding my 650DP and rebuilding a friends 750DP this week. :thumbup:

 

I was hoping that the 3310 plate would go on without any mods. You see, the 3310 is a complete, low mileage, (200 miles) carb at the moment. My plans were to use the 3310 float bowls only & put them onto the 600 carb. I know that's a direct fit, and have always liked the look of the dual line setup.

If the 3310 (750cfm) plate won't work without any mods to the 600, I'll have to wait a locate a correct plate for it.

The reason I am going to the smaller carb, is that the 750 is to big on my mildly built 350ci. More interested in retaining some kind of mileage.

 

That's really good info to know. I was just going by what Holley says on their site & from what I have read in books as far as mileage goes. Just another reason I joined this board. For good info!!

I have since lucked out & found a 1850-1 plate to try. I will also try your tips on how to setup jet sizing.....