Okay, my first bit of advice is to get it professionally checked out for around $70 by a shop that you trust. I didn't do this and was told that I needed new tires, batt, and carb. I bought my 68 142 w/74 motor because all of that would be less that $1000 and the body/interior were in decent shape. I paid the guy $950, he was asking $1100. Since then, i have not gotten a new carb, and I have spent ~$2000 on other stuff and now it needs brakes all around. I'm only a High-school senior. I made a big no-no by buying this car without getting it prof. checked first. Also, it has tons of rust in the trunk and floorpan...

My idea would be:
If it is in sound mechanical shape other than the brakes and the int/ext is decent/nice, I'd say anywhere between $1500 and $3500. Full brakes can be anywhere from $300 for used parts, or up to $600 and then you have to pay for labor... unless you do it yourself.

Just rambing on,I hope this helps,
Later,
Kyle - KLR142