Jeg's and Summit both claim the 670cfm units are for 350 engines. I have a 305. Is this a bad swap. I don't want to overwhelm it with fuel. Turbo City offers a throttle body that is bored 3mm over stock for about $190 or so. I don't know if a 3mm increase is worth the money. what do you think?

 

See the post above regarding a 454 TBI on a 305. Bottom line, your current unit is fine unless you've done some serious upgrades to your 305.

Paul T.