Wheel Question

I’ve been considering changing the wheels on my 82 and need input from this knowledgeable group.  I know the backspacing on the stock wheel is 4 inches but I’m having  difficulty finding exactly what Im looking for with a 4 inch backspace.  I’m considering the wheels in the link below from Summitt but they are 3.75 inch backspace and an offset of -19.00mm. First of all, will these wheels work on our cars?  How will that small difference in backspace affect the geometry of the rear suspension and handling?  I am not interested in going with a larger tire than the stock 15 inch.  I recently bought new tires and don’t plan on buying a new set for quite a while.

 This depicts offsets. An 8 inch wheel with a 4 inch backspace would then equal a zero offset due to the fact that it's centered. The wheel 3.75 backspace will actually be a negative 19mm. This would actually move the wheel/tire a 1/4" outward toward the fender lip. You probably have enough clearance for that.