i would like to no if a stock 350 tbi system will work for a engine thats built to 450 motor hp

 

Can you clarify your question? From what I got you want to use a TBI system on a block that's set up for 450hp?

 

just wondering if i can use the same tbi system if the motor is built. est hp 400-450

 

You can because it's essentualy the same as a stock 350 although you be taking a step backward with the TBI. Not the best that Chevy put out as far as performance goes. You're better off with a performance intake and carb set up to get the full potential from that block.