Quote Originally Posted by techinspector1
Matt, I know you've seen this formula for cfm/boost before. Let's look at it again....

The size of carb(s) or CFM required for a given application can be calculated by the following formula A: {(CID x RPM) ÷ 3456} x {Boost ÷ 14.7) + 1} = CFM required. The amount of CFM required will determine carburetor size and quantity. If you try to use a carb with less CFM than required, performance and economy may be greatly reduced.

Using this formula and plugging in 200 cid, 5,000 rpm's and 6 lbs of boost, you find that you will need 404 cfm. With 6 lbs of boost and 8.4 static c.r., your final compression ratio under boost will be 12.0:1, the limit for pump gas.

What you're interested in is a blow-thru system where the turbo only compresses air and the carb is reworked to withstand the pressure. Spend the dime and call these guys and get the straight scoop, then report back here please. I'd like to know what they have to say.
http://www.performancecarburetors.com/blowthru.htm
I was planning on running the Draw thru because the Turbo I have is set up for it, and also so that I wouldn't have to refrence the fuel pump. I know the mods for a blow through carb and on www.fordsix.com/forum there are basic instructions on how to. I was planning on running 6 PSI of boost, using an external wastegate. Is there any disadvantage to running a Draw Through setup? Thanks for the Help. I know that Kelly Mclearen runs a '63 Falcon with a 250 I6, running a blow through 350 CFM Holley 2300 2bbl, other mods to the engine such as forged pistions and the block is oringed, but she runs 11.25 in the 1/4, and the car is streetable. runs like 11 PSI of boost.