I see what you're saying, but custom BS is out of the question. I'm on a budget and have already decided to go with the wheels I've already got- 15 x 7 steelies.
One way to get a custom BS without buying custom made wheels is to purchase a wheel with too much BS then measure perfectly and get the exact size spacers needed. I'm doing that with my 69 Dart right now. I have SS springs and the offset shackle. I'm stuffing a 17x9 " Mustang Bullitt wheel in there with 275/40/17 rubber. The axle is also moved back to be centered in the wheel well so I'll run ~26" tire with no issues. Haven't finalized the spacer size needed, but I think the final BS for my particular setup will be about 4.75". Since I'm running a 17" whel and the 275 is on the smaller side to fit on a 9" rim I won't get much ballooning of the sidewall - which also helps with clearance.
