Not bad.

Big thing is, and think about this. Money spent is money spent. Are those $50 heads good heads worth using?

If it were me, I would get a decent set of heads, have them torn down, cleaned & checked (possibly resurfaced if needed). Rebuild them, get some rockers, good springs, etc... port and polish these, and then just swap them over. If they don't work out well, just swap the stockers back and no biggy, or you can then port the stockers and sell as P&P heads and get money back into your pocket.