It depends on the sound that you want. Youre probably used to the awesome sound that comes in factory cars these days, which tend to have at least 6 speakers. I am new to the classic world, so i am not completely familiar with my mustang's interior yet, but i already assumed there would be some customization involved with stereo component placement. But if you can manage to get two speakers in the rear, and two in the front, you should be good in my opinion.
__________________ 1965 Mustang Coupe Project: 1965 Mustang Inline 6 (For Now) Coupe, New Floors, New Quarters | Ford 9 Inch Rear, 11" Rear Disc Brakes, 3.50:1 Gears | Control Freak Front U/L Control Arms, Global West Adj. Strut Rods | KYB Gas-A-Justs, Grab-A-Trak 620 Coils & Mid-Eye 5-Leafs | Global West Tubular Subframe Connectors | Addco 1-1/8 Front Swaybar Kit |