Too much work- I ended up using the B2 head as is, except I had to use my B7 cam. The B2 one was scored on about 6 lobes. The B7 valves were CAKED with crap, even scraping and wire brushing didn't removed it. Plus it had the two burnt valves to begin with. Screw the valve seals, screw everything. The head is back on. I have to finish bolting stuff up, then fire it up.