Difficult cold start

I found this in ebay:

Not a good pick; read this (about the same kit/same seller).

Then read about the HEI upgrade for a guide on how to do it better.

Can anybody suggest mini starter that would fit to -64 valiant with 170 slant from rockauto?

This one. As with all others you can buy now, it's going to be a Chinese copycat part.

Didn't sound like your starter was having problems, though; what makes you think it is?