POL arms and stock springs?

[Bloodhound]

So I am assembling the front suspension on my 81 C10 LWB. I went with Performance Online upper and lower arms, with stock springs and original stock spindles. Obviously not doing the lowered thing here. I am very happy with the quality of these arms, so that's not an issue. However, as you can see, with the stock springs in, the upper arms are resting on their bumpstops on the crossmember. I am hoping that with the weight of the the motor/trans and everything else added it will come down. But I am worried it may not. I threw the wheels on and added 500 pounds of friends to the front and didn't really move. Any thoughts here? If you spot something dumb that I did please point it out...