64 Dart centerlink

Looks like the center link in my 64 slant. I can't say the one in my 65 273 looks much different, maybe another 1/2" drop. Like in VDART's photo, hard to tell without measuring closely.

I think all 1964 firewalls had the V-8 distributor recess. The only difference was between AC and non-AC cars, at least in 1965.

The seller might have been confused since a V-8 will drop into an early A slant car, if you add a V-8 centerlink and the motor brackets, or maybe he/she didn't understand your question.