Rusty said oil varnish. Wouldn't surprise me, this thing is pretty grody. Lol. I'll know more when I get the cam out. I'm just taking my time and keeping everything in order.
I'm hoping to reuse the cam/lifters.
I have rebuilt heads for it
I have MSD distributor/6a from another build
New freeze plugs
New flowkooler water pump
Regasket it
Maybe bearings
Send it - lol