your old 360 heads, 2.02/160 stainless valves, get the intakes machined for 2.02's, skin cut the heads flat and clean the roofs of the ports with a carbide bit and sanding roll, blend in the new seat. $70 in parts, 4 hours with a die grinder and probably $100 in machine work. $1500 can buy you a pair of used W2's or Edelbrocks as they come up here often.