Car seats are a tight squeeze in E-bodies. I have 5-year-old twins. Since they were two they've had to fold their legs to ride in my Cuda. For a 6'-2" adult to fit in the front, the seat has to be back all the way. This leaves little room between the front and rear seat. When my kids were small their legs stuck out past the car seat and hit the front seat backs, so they'd have to fold their legs. Now their legs are longer and hang down. But there isn't enough room for their feet to face forward, so they still have to fold their legs.
Regarding seats, make sure you get one that will convert into a booster seat when they get older, otherwise you'll be sheling out more money when they are five.
Evenflo makes some really cool looking race-car style kids' seats. I have them in all of my cars. The wife has some classy looking Gracos in her Jeep.