ok so ive got a 92 rs with a 305 tbi and i happen to have some 350 heads lying around i believe they will fit and bolt up but will they work i was thinkin the main prob with the 305 is the fact that they dont flow well and the 350 head will flow a bit better until i can get the 350 built the way i want it anyway the difference im concerned about is the combustion chamber being a different size than my cylinder anyways just wanting to wake the 305 up a bit while working on the other motor so any help would be appreciated

 

right idea, wrong approach. Your 305 only has 8.8:1 compression, and 350 heads aren't going to help any. What you want is a pair of LB9 heads, the last 3 digits of the casting number are 081. The best way to start is with 3.42:1 gears in place of your 2.73:1s. Also, even the LO3 you have will respond to headers and a 3" cat back.

 

ok thank you for the help im already about to install headers and a full exhuast in preparation for the other motor and gears are one of my many other things im gonna change. question what would be the best gear ratio to go with its got a 700r4 when i get the motor in id like to beef up the tranny and install i higher stall but what gears to go with?