I wont to convert my 67 over to 4 wheels disc. It has aftermarket rally wheels on it how do I know if they will work with disc brakes? Also is it worth to do the 4 wheel disc conversion?

 

You should be fine with your aftermarket rally Wheels.

I've only converted my front's to disc and I noticed a huge improvement. At minimum, at least convert your front brakes if you've got the cash since most of your stopping power comes from the front brakes.

One advantage I see of having 4 wheel disc brakes is you don't have to worry about them coming out of adjustment, which will give you smoother stopping power which means you'll be less likely to have one brake lock up before the other and put you into a skid if you have to stop really fast.