I will give this one a try!
Considering two cards that can't be used to make a str8 or a flush u can feel confident if u flop the following hands:

Two pair (using both of your pocket cards) from two non-pair cards - 1:49,
(however this will very likely give u 2 small pairs which are really easy to loose money with if u can't judge when they no longer are the best hand.)

Trips (using one of your pocket cards) from two non-pair cards - 1:73

A full house (using both of your pocket cards) from two non-pair cards - 1:1087


Quads (using one of your pocket cards) from two non-pair cards - 1:9799

If these are the kind of hands u plan to flop the combined odds are:
15:427 ~ 1:28,5

Plz correct me if I'm wrong...

So if u take that into account you never have odds if u don't have a good enough read to KNOW that u will get payed from some LAG player who don't know what he's doing and therefor giving u implied odds. So unless u KNOW that someone will pay u off.. throw the hand away.

That's my way of looking at it anyway.

GL

//SUND