Uwiik, sounds like you will have a pretty nice combination.  On the 4100, I am curious where you are getting it.  It is not one of those things commonly found on the parts shelf these days and there are things that you want to be aware of when using the 1.12 carb on the SBF.

IMHO, there is nothing better than a well matched 4100.  They are reliable, simple to work on and with their annular discharge, very economical and responsive.

Here is a link that may be of interest to you. It is basically all about 4100's.

http://www.network54.com/Forum/88781/

Thanks for the great responses guys! Put my mind to ease knowing I ordered the right part. I bought the carbs from www.gottafishcarb.com, He's got an Ebay shop too and frequently stocks some really rare stuff such as original number Hipo carb. 
Judging from how my current Autolite 2100 works against some older Holley found here, I am sure I made the right decision going Autolite instead of Holley or Edelbrock. 
I am planning to go 3.55 from 2.79 I currently have (ha ha I know), but I just need to rob more banks to recoup the cash I drowned in this money pit called Mustang, the shipping cost and exorbitant 40% tax on top just does it to me.......3.55 along with limited slip is on the list of next upgrade. Thank you very much for the tips on tuning, so much appreciated. Do you have any particular tuning recommendation for my particular super wimpy gear? 
 

I am trying to make as "stock" looking as possible, hence the Autolite 4100 choice. 

Does Holley Street Avenger looks exactly like Holley 4150? I never see street avenger in real life. I know Holley 4150 is stock on Mustang but was put away by some negative review of 4150. I originally had my eyes on street avenger and sure the reviews on street avenger are glorious but I was doubting the look on vintage and was steered to Autolite 4100 because of everyone's review, and sure it looks really nice on vintage.  

Actually there are a lot of Holley 4150 lying around collecting dust in my friends workshop, they sat there being neglected replaced by edelbrocks. I actually was thinking about making use of that neglected Holley 4150 since I can get it for free, but had no idea about optimizing it and what to look for. 

Last edited by Uwiik (5/12/2013 10:00 AM)

With the 480 cfm 1.08 - Stock Ford cast iron

With the 600 cfm 1.12 - Weiand Stealth

I ended up going to a Quick Fuel 650 Mechanical secondaries, great carb for the performance guy that wants to tinker all the time, but I miss the Autolite, I put it on, set it once and forgot about it. The Quick Fuel carb has a much harder hit when you put your foot in it, it just doesn't seem to stay set where you want it.

Here is what the Summit street/strip carb looks like on my 393.