Hmmm, mush factor......well, I'm afraid you're kinda out of luck when it comes to that, because even the mighty Thor has been known to get a bit mushy after one good hit from the Hulk. Of course Thor is a god, so he can bounce right back, but Cap? Not so bouncy. It all depends on the type of hit he takes, though. If Hulk hits Cap dead-on with all his strength, then Cap is going down pretty quick, but if he just grazes Cap, or tosses him aside with a swipe of his hand, then Cap would probably get back up pretty quick and continue the fight, given that Cap knows all about the importance of relaxing his body to absorb the impact of falls, etc., and he knows all sorts of martial arts blocking moves, and ways to come back and counter attack.
But even with a strength boost, Cap would still get creamed by the Hulk because a boost in strength isn't necessarily a boost in durability--the ability to lift 2 tons isn't going to keep him from getting a concussion and blacking out, you know? Cap's only chance of surviving a battle with the Hulk will be to run around like a (graceful) chicken with his head cut off and try to get in a punch or a kick in whenever he can--a lot like what Blonsky did in TIH.
You shoudn't worry too much, though. I don't think Marvel will be stupid enough to have Cap get taken out with one hit like Blonsky. And the guys at Marvel probably only made Blonsky get taken out with one hit because they had to give him a reason to really want to get a power boost so he could become the Abomination--and what better reason can there be to get a power boost than getting taken out with one kick?
And, a final note on the car throwing vs. lifting debate
......maybe we can have Cap throw a dirt bike and split the difference.