[Big Baby]

I'm building a 84' 351w engine for my 83' Bronco I've got It bored 40 over with stock connecting rods and bearings but, my question is can I use flat top piston with 2 valve releafs with stoke heads having 60cc chamber 1.80 intake 1.40 exhaust valves with a 120 lbs on the valve seat.If so is it nessesary to deck the block becouse the piston is .025 under the deck (by the way my connecting rod length is 5.954.) thank you.