Everything I've read has said that you want to match the factory weight distribution as close as possible, so my thought is that 3 in the back and 4 up front would be the way to go. I could be wrong but I highly doubt an extra 45 pounds in the rear would noticeably impact handling, especially given that the lighter 4cyl engine weighed 375 lbs according to google. I'd also think that if you have to go a bit over it'd be better to do that on the side where the power meets the road. You could get slightly stiffer shocks in the rear too. Just my .