[Ghetto Jet]

Taking the heads off is an easy job, I wouldn't turn it into a rebuild that isn't needed. You could probably grab a better set of heads off ebay/craigslist or a ford forum for cheap.

 

[Ghetto Jet]

if you use these your bottom end will go boom. an old motor does not need hp thrown at it. just get the old bolts out that broke off . and rebolt them on. you say you do not want to throw money out the window. put on new heads and you will spend a lot more down the road as most of the parts will not be useable on the rebuild. like the block with a big old hole in the side of it:nono:

I've seen engines making real horsepower run over 300,000 miles without issue. This 351 will probably be making a whopping 260 horsepower, the extra stress will be negligible. Although I would change the timing chain if its original.