From my understanding intake and exhaust runner size has a huge effects on torque especially with heads for a primarily street engine (big block) . Correct?

Question is how much and what is a considered to be too large for intake runner cc. Were talking a pump gas big block?

Then next question is they efficiency of an oval port versus and rectagular port head for a street motor. Have always read to go with oval port for street use seeking torque . I have trouble with this concept cause most of GM's crate big block motors sport rectangular ports. In fact if I remember correctly all of GM's current crate motors with the exception of 1 use rectangular ports.

So any eduacation I can get from others to understand this will be much appretiated.

Thanks for sharing your know how gentlemen.