[FerociousP]

from a thread on the evil forum:

whooaoaaaaaaaa, the RB holley will NOT be good for boost. it's wayyy off for even a good starting point. even the 4150 model double pumpers have to be put threw a process of milling, changing parts, different gaskets, blocking off passages, drilling, etc... before it will accept boost. do not boost that holley.

start off witha real holley... ohhhh i dunno 600cfm 4150 double pumper. get center hung nitrophyl floats, jet extensions, mill the choke... ahhhh shit. if your serious start a thread about the proper holley to use for boost.

no wait, go here www.turbomustangs.com/forums/

go to the carb boost section and you'll see what's involved.

I boosted a holley on a 12A. Its not a simple thing. You need a manifold referenced power valve,4 corner idle,adjustable air bleeds, custom downleg annular discharge boosters,the nitrophyl floats, jet extensions,custom bowl venting and a few other things....a carn hat as well. Even then you will get marginal streetability. I own 6 books on modifing holleys. I also spent close to 500.00 on the carb (things I couldnt do myself). If you really want to pursue this I would suggest a webber to start with. But honestly when your done for the same money you could have fuel injection. And much better streetability. With my holley boosted 12a it would drive ok and then without warning take off like a bat outta hell...I mean rip your hands off the wheel fast. This sounds kewl but without warning it wasnt. No one could drive the car but me. Even with professional help a carburated turbo will never be as good as FI. Im sure someone will argue with me on this,but I spent almost 4 yrs with this set up and really know what Im talking about. I now have the same car with a FI turbo 13B and am sooo much happier. Just my advice,good luck.

I didn't read your link about the boost prepping so there may be different ways of doing things, these are just posts from members who have experience with carbs. I'm interested to hear what RB has to say about it though. They may have a solution.