Hi... I have a 1970 Buick Grand Sport that has a 350 motor running around 385 horse... it has an open rear end with 323 gears... I am considering on changing that to a positraction unit with 373 gears... will i feel a big difference off the line or no?..

Welcome to AF!
Please only post ONE time per topic in the threads. I have merged the same one you posted in Performance with this one.

is originality or performance important to you?

If you drag race, you really need posi and you'll really appreciate the difference. If you just cruise it's probably not worth it.