I'm installing a extreme energy hydraulic flat topped cam 218/224 dur. in my 305 bored to 315. I'm also installing World products SR torquer 305 head which have 58cc combustion chambers with 1.94"/1.50" valves for better midrange torque. I'm running a 3 duece set up with rochester carbs. I have high gears 2:76 with a stock convertor. If I keep these gears will I need to go to a higher converter? I know if I change to 3:55 gears it would improve the performance of the engine, but when I cruise its usually around 70-75 with the rpm's at only 2500 so my mileage is good.

If I do go with lower gears, what torque converter should I use?