I may purchased a set of Weld Draglites 15X10 with 5" B/S and they are drilled for rims screws on both sides frt and rear. My question is will rims fit a 70 Chevelle with stock springs with out any rubbing with a P27560R15 tires. Yes I have done a search I see Draglites that will fit 70,s with 15X10 with 5.5 B/S will that half inch make that much difference? Then the rims screws hoes will it hold air with a tubeless tire without any leaks on beads? Thanks Dave.

should be ok. the screw holes aren't where the tire bead seats/seals on the rim of the wheel.

That backspace will probably get the tires real friendly with the rear fender lip. Did I get this right, are you planning on running these on the front also?
Mike