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I have an 83 f150 with a 300 and was thinking about goint ths route.
"Fitment: Any Ford 240-300 Truck from 1969 & up with 2 wheel drive, and 1980-90 2x4 or 4x4 with non EFI. Use the Clifford *COMBINATION to gain 45% more power and torque than stock when useing our 465 CFM Holley Avenger. With your order, you will receive our 53-0960 dual outlet header, 43-4502WH Intake Manifold and 08-1014 4 brl carb adaptor, header gasket, street hookups, bolts and gaskets. Yes, your engine will run with great power and much better MPG with the small 4 brl carbs. Now that you have saved money with our *COMBINATION price, order you new Holley now. "
and was going to run a holley truck avenger 470 cfm.
Don't be in a hurry. Read this Forum and the fordsixperformance Forum...every page before you jump in on Clifford's deal. There are other suppliers of manifolds, cams, carbs, etc. and you can put together something that will work for you. But you have to have a plan first starting with answering the question "What are you going to use your truck for?" and then plan your modifications to match the use.
The Holley 470 would probably work quite well with an Offy DP manifold but do your shopping...JEGS, Summit, eBay, etc.
If you are looking for the ultimate street machine do a search here for Col Flashman and his build.