i recently bought the Pro car 90 series seats for my 65 nova and i need some help with positioning. First off should the brackets be level? or tilted slightly down to the rear of the car? second, the brackets that came with the seats 'hang off' the seat hump on the floorpan, meaning i would either have to put a 2" spacer underneath 2 of the 4 bolts or hve to move the brackets and reweld them. third, do i match the original front left and right holes from the bench seat to the front left and right mounting holes on the new seats?