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With the price of aftermarket heads running close to our national budget, you might consider al the modifications we "Stock" car guys did to improve the these engines. Ahgle the heads as much as you can the EAB heads are liminated to the area of the thermostat housing thickness, Byt the 59 heads can go much further, Starting with a good set you can use little balls of aluminum to measure the piston clearance of=ver the pistons and valves. Looking for about 40/50 thou over the pistons and .050 over the valves at max lift. angle mill the heads they hit thhe valves, the using a larg diameter shell mill clearance a little materila from the valve area at a 4 deg anngle. Now use a dremmet to make sure nothing hits without a head gasket. This work isdonwit some machine shop and milling machine work and would probably cost several hunderd dollars. Using a Max!1 cam and 59 heads this will give around 65 cc or a good poing in CR, boring to 3 5/16 another point in cr. The stock 6.8 CR engines usually measure around 8:1 because very few engines have much over 6:1 from the factory. Another thing you can do Is use a merc intake, bored to except a 2GC carb and one of Charlies distributors. Now you'll have an inexpensive engine that will last forever, have lots of power and great economy,