I actually meant the later '73-up B bodies. Over at Big Block Darts website, they talk about everything but track width. I would hate to have to take a tape measure to a car show. Getting my butt whipped for a measurement isn't alot of fun......
No track difference from the 73-up B (also FMJ-body) spindles you have now than the 73-76 A-body spindles. You're fine.
No one is going to take a tape measure to you front track at a car show either. Your car looks like a restified or modified car and with those classes mods are welcomed.
Looks like you car is set up for handling. I see a 1 1/8 sway bar and maybe 11.75 caliper adapters. Cool !!