I'd do the gears first, with an auto
trans stay with a 3.50 or higher ratio (numerically lower number) see how you like the improvement the stock cam will handle it ok for now, some other things to think about-a shift kit for the
trans and a street stall converter. Also think about some traction bars. Yes this hobby gets expensive...
When you decide to upgrade the cam call one of the major comanies, you could ask us but you will get as many different opinions as people that respond...everybody has an opinion on cams and most of us actually don't have a clue...
. The customer service people at the companies are usually really good, tell them what you have and what you are looking for and the'll lead you in the right direction.
Actually sounds like you need some good info more than anything else, There are a ton of good books out there that will get you moving in the right direction. Goggle it and see what comes up, but get a couple of good books and start reading.
The best thing you can do is come up with an overall plan that meets your budget and then stick with it...if you do this piecemeal you will more than likely spend more than you wanted to and be unhappy with the results. One upgrade leads to another and before you know it the bank account is empty. You've got a good start but from here you can go in any number of directions but you can't unless you're flush with cash do them all at once.
Good luck.
please help. 1966 Mustang 289 v8 want it to go faster off the line 
Assuming that the motor is running right and the timing isn't really retarded, I would say that Vortex hit it right between the eyes. It is entirely possible that you have a 2.89 or a 3.00 rear end. which is going to be a bit of a pig coming out of the chute, no matter what kind of horsepower output the car has. Something like a 3.50 would really bring it to life without completely killing your top end.
