71 nova front suspension setup advice

[MC71Nova]

I'm considering a CPP disc brake conversion with 2" drop spindles and a tall lower balljoint conversion. It's my understanding the brake conversion pushes the rim out about .20" from the stock drum facing. This would be mated to an 18 x 7 inch front rim with 4.5 inch backspace and a 235 tire (American Racing CL 205's). Any experts out there who can tell me if this has a more than likely chance of interference with outer fender lip or fenderwell? Would it be possible to go even lower... say 3" from stock? I know "stock" varies car to car but this appears to be stock original springs and all original suspension. With the current 215/70r15 tire, the bottom edge of the highest part of the front fender lip is above the top of the tire when viewed level from the side. This needs to be remedied!

My only experience with lowering was way back in the day on a '72 Nova with severely chopped springs and stock parts and a 185/70R14 tire on a cragar rim. That bad boy left only about 2" Xmember clearance and no rubbing but the rim/tire combo was tiny by today's standards! Looked really cool though... I love that slammed look. Thanks!