Stock and drop formula, wheel vintiques?

[78GMC_truck]

So according the Squarebody syndicate formula on their website they suggest you custom order the 62 series steels wheels from Wheel Vintiques. Front wheels 15x8 with a 4" backspace and the rears 15x10 with a 5" backspace.

I called Wheel Vintiques yesterday to order these wheels with the custom backspace. They said that they can only do the 15x8 in 4 1/4" backspace and NOT the 4". They did mention that if I ordered the wheel inverse (flipped around) that only then they could get the backspace to 4". But that would give a slightly different lip appearance.

My question is what kind of fitment issues would I have if I ordered the 4 1/4" backspace on the 15x8 (front wheels)?

Is there any other company that makes the O.E looking steels wheels that I can custom order the backspace and still be able to install the poverty caps/dog dishes.

thank you for your time.