Thread: need help, pisron hits valve

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I'm building my first mild 454 (.060), I was done with the short block assembly yesterday. I installed the Cyl. heads, intake and exhaust pusrods, and rocker arms on one cylinder I turned the crank over and it gets stuck. Exhaust valve hits dome of piston. Is there anything I could do to fix this without changing the rotating assembly or cyl heads. (Could i get a smaller cam) black spots is where the valves hit (pics below). I have spent toooo much money on all these parts and machine work, pls help.
Engine specs
*speed pro hyper. Part # ZH581CP60 Dome height .340" W/two valve relief
*Standard rocker arms 1.72
*stock length pushrods 8.280"/9.250"
*Elgin E930K cam .503"/.528" 292/302 (214/224 @.050) LC 112 w/ matching springs
* stock length stainless steel valves 1.72/2.065
THanks