Hey, If valves are hitting pistons and you cant rotate by hand any further.
Remove the valve springs from no1 cyl put head back on rotate it and see what kinda valve depth allowance your getting and keep your head gasket in the 30thousandths or .030 when figuring and measure and remeasure, cam should be straight up for this test to start but its just one of many starting points. If you have any questions you can Pm if you would like.