Well around east texas alot of folks use Ronnie Gragg at Jericho Machine Shop in Center, Tx.. Some guys that make big power say he is the world's best at head work. Ronnie is a former stock and super stock racer and is now an electronics class bracket racer. The motor I am putting together for the el camino is a Gary Luce built short block, Jericho Machine Shop heads and intake. Ronnie is very good and cheap too, and he works on all makes of motors. Give him a call at  936-598-5702 and see what he can do for you. You may have to leave a message, this is his shop phone and he stays busy.