1958 Impala w/ 348 rear axle gears

Hi I am finishing up putting my 58 Impala together and I had the 348 rebuilt and now i want to put new gears in the rear end to give it a little more torque. I was wondering if any of you w block guys know what are good gears to run these motors with and since im not sure where they build there power I need some advice. I havent talked to my engine guy about which exact cam hes putting in all i know is its an isky flat tappet cam designed to run with the 3x2 setup. I was leaning towards 3.36's or 3.55's, what do you guys think? Also it has the original powerglide trans.

 

my new tri power 58 came with 3.55's, they did well back then.

 

in the 50's 4.56 and a 4 speed was the norm in so.cal. I'd pass on them today lol

 

If you're just crusing around, 3:36 is a nice gear with the PG and the torque of the W engine. More performance and you're talking 3:70-4:10, but that's sucking gas now days.

 

My 58 came Stock with a 348 4 bbl and p/g had 3.36s

 

Since your car is a Powerglide car it came with 3:36 gears from the factory - why change?

 

16 yrs old, 348 3x2, 411's, 8 mpg, gas. 25 per gal---do the math with todays numbers...