Eh, what's done is done, TS. Not like it's the end of the world tho. as long as the engine/drivetrain works and no rust affects the frame that it's detrimental to the safety/structure, you'd be good to go!

You mentioned yourself it's a dream car that you aspire to have, so now you're in the way of getting one, what's a few more K's to make sure it drives and performs well, eh?

I just recently owned an old carb car as a backup transport.. which happened to be one of the cars I've been eyeballed during my youth! so while I could've done better and some know-how on the inspection, as long as one doesn't exceed and put a burden on him/herself, you're good to go, IMHO