@Jonnylightening, first question, dome or dished piston? If a dish, how sure are you of the volume of the dish.
When i ran your cam through wallace, it said your intake close was at 70° atdc. Four degrees probably makes a difference. Have you degreed your cam? Is that where the (almost) 74° comes from?
Whoa, wait a minute, back up the truck! What the hell is intake closing point AT FIFTY THOUSANDTHS ? Is it closed, or open at .050?
I think they mean at what degree is your valve .050 away from closing, tho that is NOT what they said. There is your error, you input your ACTUAL closing point.