tatao-- I would think that the 750cfm would be too much carb for a 250, even if it was running a turbo. You might be able to get it to work alright with a lot of tuning. I think a 390cfm or 450cfm Holley would work best for a mild 250 and turbo. I'm planning on using an Edelbrock 600cfm electric choke on my 250, but only because I have it on hand. I'm going to buy a kit for the carb and try to tune it so I don't have to worry about over carbing the engine. I've heard good and bad things about the Quadrajets. I've only heard the results from them being used on V-8s. They are good because of the small primaries which give good throttle response, but the secondaries are really big, esp. for use on a small 250. I think the smallest cfm for Quadrajets was 725 or 750 cfm. As far as tuning them, I have heard they work great for larger engines, but that most people don't know how to tune them. Again, this is what I have heard from various people. I have almost no experience with the Quadrajets.
As far as how the carb is run in a draw-through setup, I'll have to break out ome of my books. I can tell you how the system should work, but I can't remember right now how they are physically connected. I posted that same question somewhere on the board (maybe this thread), and I think David helped me figure it out. Not sure right now. A blow-through system is easier to understand, because everything is where it usually is. I hope this makes sense, my brain is kinda fried after school today. John.
