ive got a lt1 cam but should i go with it im planning on getting 4.10's posi ive got full exhaust done and i got edelbrock 2'bore manifoldand a holley tbi unit on the way.also whats the most possible i could bore out the 305 block jus wondering. also my car is automatic but im getting a manual valve body and a racthet shifter.also i need to get something done about these heads i need to get them ported or something also how would i raise the comperssion like to 10:1 becaus i hear that the stock tbis are 8:1 some where around there.

 

stock compresion is 9.3:1

you are better off getting diffrent heads, porting the stockers isn't worth it.

i will hold of on cam recomendations until you pick heads.

i also woudn't bother with machine work on a 305, if you are doing a rebuild, you might as well rebuild a 350.

with any new cam/head combo, being an auto, you are probably going to want a stall, depending on the cam you pick, you will likely be in the 2600-3k range for the stall but that will depend on your cam.

 

hey i read a mitchell book that the stock compersion for a 1989 firebird formula 305 tbi is 8:1 not 9

 

That is wrong. It is just as dewey said. Also 4.10's would be overkill for any 305. I would look at 3.42's or 3.73's. Like dewey said. The stock deads are garbage, the stock compression ratio is just fine for stock and or modded 305's and you are going to want to look at a stall. I would try a few searches to help you decide what to get for each stage of the car that you want to upgrade.