Putting head on slant six

Max; looks good so far. Rent or buy a valve spring compressor. It looks like a large C-Clamp. Remove the valves and keep them in order. Inspect them and wire brush off the backside. Buy a valve lapping 'spindle' type tool [cheap], and a small can of lapping compound. Have at it, and if it turns out ok, put in new seals and assemble.