what make model of carb for '64 slant 225

My 64 Valiant slant has a Carter BBS. You can find a pdf manual on-line. Whether Carter or Holley, your year should have a rotating rod from the throttle instead of a cable, unless your car was originally a V-8 (unlikely).

I second Bill. My "new" 64 Valiant 225 manual trans has a BBS. I believe it's a model 3677S?