273 spark plug mishap

I bet there are NO valve seals left on that 273, they are in the pan as petrified pieces. I have yet to take any LA head down and find 8 valve seals. You can install a set in about 2 hours with a simple 'on head' hand valve spring compressor and some rope to stuff in bore to prop up valve. That and a whole can of sea foam ingested through the power brake hose and allowed to soak in over a long lunch.