That number doesn't sound correct. With your domes, duration on the cam, and valve lift, if you get numbers higher than .180" you had better measure again.
To check the clearance, you need to set the valve lash to .000" with the pushrods and the rockershaft on. Then you rotate the engine over to 10*BTDC on that cylinder (#3 would be 100* on the balancer). The camshaft will actually open the valve and start allowing it to close. Then the exhaust valve is depressed additionally by hand until it touches the piston. The extra distance the valve will depress down from the rocker is your clearance.
When you come up with your number this way, you can always add your valve lash to the number and come up with your running piston to valve clearance. Say you come up with it being .075" and your normal valve lash is .025", your piston to valve clearance is .100".
Hope that this helps,
Bill M