4af intake manifold option? Underdriver pully options?

[ae924af]

I have a 89 corolla sr5 im working on currently. I have been told that you can port and polish the stock manifold in order to get better airflow from the carb to the cylinders. I was wondering if there were any options in after market manifolds or other manifolds that would work better. I am also looking for under-drive pulleys for the engine, what kind fit?

[Flashmn]

none what so ever available in either an intake nor pulleys atleast directly, I'm sure you could find pulleys that fit, but I'd see how the 4A-GE ones would line up. I wouldnt bother with port and polishing the carb manifold.

[ae924af]

Why shouldnt i port and polish it?