[1blackbb66]

Mike,
When Ford started installing PCV systems in the mid 1965 model year run they also leaned the carb jets 1 to 2 sizes. Although some view the PCV system as a controled vacuum "leak" the fumes being drawn from the crankcase are combustable and enrichen the overall mixture. If you install your system as I described it will work perfectly. I run a .588 lift, 280 duration cam in my 475 horse 460 and I have never had any problems even during 5500 RPM WOT dyno runs. I have 10" of vacuum at idle and 20" at 65 MPH @ 2900 RPM with a single 750 CFM Edelbrock. As someone mentioned here, vacuum, or lack of, could be a contributing factor in your problem. Dual quads are cool and give that original look but if your running two 650 or 750 cfm carbs you are way over carburated unless your 427 is making near a thousand horsepower. Carburated engines need vacuum to opperate efficiently and efficiency translates to horsepower. Drag out any cataloge and look at what kind of numbers they are getting these days from big blocks with single 750 or 850 carbs.
but I digress...........get your plumbing in order and you will have an efficient leak free PCV system.

Ray