Well, I was thinking about responding to this post last night. This is a whole lot bigger than a carburetor/intake question. Tech beat me to the “punch line” but he went exactly where I would have. Maybe we can backup a bit here and help you out. I would also recommend you read this thread to understand/appreciate the wisdom on this site – especially where Tech is involved:

355 build HP and Torque?

Adopt Rollie’s mind set and you’ll find that we can give you a lot of help and get you where you want to be with your ride. So let’s start with some questions:

What is this engine in?
What is your rearend ratio?
Automatic or stick? If automatic, what is your stall speed?
Which 305 heads? Do you have the casting number(s) and why did you go with 305 heads?
What pistons are in the engine?
How did you determine that you have 11:1 compression ratio? As has been mentioned, at 11:1 you’d be hard pressed to have this engine running on pump gas.
What make and model is your camshaft?

These are the basic questions – let’s get through these and see where you’re at. You’re certainly at the right site to begin your “engine education” but it’s up to you. Know-it-alls don’t do well on this site, but those who have a desire to learn and want to take advantage of the deep knowledge the people on this site represent can come out as real winners. It’s your move

Regards,
Glenn