C4 won't stay in Park?
 

I am about to start my fresh 289/c4 combo in a '67 Mustang. Though the
shifer seems to be a little off as per the shift selector light in the
center console, it seems the transmission doesn't lock in place when in
Park. How do I know this without driving it? When in P, we can move the car
back and forth without resistance. This worries me. The shifter slides too
easily from R to N, I kinda have to slowly put it in R and feel for the
click, then N. How do I fix this? Thanks in advance.

-Eric

go to your mustang parts dealer and get a GEAR SHIFT LEVER REBUILD KIT

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66' coupe
200 inline 6 disk brakes and Ac
65' Fastback with 351W not finished
2001 V6 laser Red Tan inside

I agree with driggins. I had the same problem in my 66' but I just went and put in a hurst shidter.

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66 Mustang Black W/ Black
289 Hi-Po 65'heads, MSD
Lunati High lift Cam
750CFM Carb Heddman Headers

You should be concerned. You don't need it rolling down the street on its own. Sounds like the shifter needs rebuilding bad.

Get it fixed and make sure it is going fully in to Park. If you're not sure apply the hand brake.