Getting the battery out and doing a wire tuck really helped clean out my bay. Granted I don't have AC and I moved the high pressure line of the power steering. I'm also running megasquirt so I completely removed the stock ecu. I also got an afco radiator and mounted it where the ac condenser was.

This was the summer before I turboed my car.

Delete cruise control and ABS, if you have them. Aftermarket coolant tanks get rid of the ugly plastic OEM.

Are there different 420s engines? Ive got a 2.4l valve cover sitting at home, im not sure if its compatible with my 420a rs.

im pretty sure most of the 2.0 and 2.4 valve covers are the same everywhere it matters.

well maybe not. it looks like the Pcv system is a bit different. doesn't mean you couldn't get it to work

On the PT and SRT valve covers there is one bolt hole that won’t line up. It’s in the spark plug valley by cyl 4.

If you want to use a 2.4l cover you need one off the cloud cars (stratus, cirrus, breeze).