EFI or Blowthrough?

You really should go with efi, I installed an ms3 on my big block and it made a huge improvement over a carburetor. The improved throttle response, the tuneability is much more refined over a carb, the cold starting was the biggest improvement, that motor was such a cold blooded beast I almost disliked driving it I could start it up and let it idle until it reached 150-160 degrees (about 5-7min) and as soon as I started driving and I would stop at a stop sign (Theres 3 within 3/4 of a mile until the main road) I would have one foot on the gas and one on the brake to keep the engine from stalling. Once on the main road it was fine when I stopped.

Just that alone made it worth while, another plus was in the fuel I ran with a carb I ran a 30 percent mix of 104 octane race gas mixed with 93 octane. With efi I just run 93 octane due to better fuel atomization with no noticeable spark knock. So I don't think you would be disappointed with efi I certainly wasn't. What ever you choose good luck.