i am looking to build up my 305 on my 1990 camaro rs and right now i am looking for upgrades and one of them is a TBS and i know it sounds stupid, but how can you tell if my car is a TPI or TBI

 

If its a stock setup, RS 305s of that year were all TBIs. TBI cars have an air cleaner housing that looks just like older cars had. A big round thing on top of the engine. If it was a Z28 it may have a 305 TPI whose air intake system looks more like a big funnel flattened out and wider at the front. Also, if original equipment. Check the vin number. The eighth number from the left is the engine ID letter. If its an E, its TBI. If its an F its TPI

 

what is a TBS?

I believe exhaust is the first mod that is recommended

 

throttle body spacer?

 

Spacer is a waste of time. Until you have exhaust (ie headers), your wasting time doing anything on the top other than maybe an open element. Do headers first - you need to be able to get any other increases OUT of the engine before you worry about getting any increase In the engine, and the TBI exhaust is very very restrictive.

 

Check my cardomain on page 3 and on to find the answers you seek.

 

Robertfrank's TBI is a beast when it comes to TBI's, listen to him and learn