Nova Dude, if you do change to a 3:08, another idea/recommendation is using a 200-4R tranny. Its a direct bolt in, just move the crossmember back a few inches. This way you don't have to worry about driveshaft mods. I have started with a Powerslide (ha)but with today's type driving it was obsolete, so I changed to TH350, much better. Then I changed to 200-4R and WOW! Even Better. I run about 2000-2100 RPMs @ 75 MPH. I did these upgrades while I still had my 230 in my car. It runs the same with my 292. Just a few ideas! HAVE FUN!
-Ted