When my son was rebuilding the 350 in his truck, his heads turned out to be toast too. He was on a VERY
strict budget and we couldn't find a set of original heads anywhere close that were worth saving, so we started looking at aftermarket.
We discovered a set of cast iron heads at Summit Racing (P/N SUM-152123
) and started doing some research. Come to find out, that head is actually manufactured by Dart and doing a Google (or Yahoo) search showed it to have some pretty good feedback.
We took a chance and got a set and I have to say I was impressed. For the money, they run just as well (if not better) than the stock Chevy heads and so far (it's now been 3 years), they've held up well.
Note that the cc for these heads is 72, so more than your original heads so they may not work for you, but my real point is that don't overlook the Summit "house brand" heads since they're not manufactured BY
Summit, but FOR
Summit by various manufacturers. As another example, the Summit SUM-162109
aluminum heads are manufactured by Trick Flow. We thought about going with these since they meet California emissions regulations, but they were a little more than he had to spend (and his truck is off-road only, so the cast iron were fine).