67 Notchback disc brake/suspension questions

I have a 67 notchback, it’s complete, running, good little cruiser. Underpowered with the 273 but it’s completely rebuilt and I’m not going to really do anything to power it up. My concern is the suspension/disc brakes. It has custom built Coy wheels fitted for sbp. I want to do a disc brake conversion/rebuild the front end/steering box. It’s so sloppy driving this car I get nervous going above 50 mph! There’s so much play in the suspension/steering wheel travel that I have to use both hands and white knuckle it because I never know how much I have to correct the steering wheel when I go over the smallest bump doing 45-55 mph on the road. It’s frustrating because I can’t drive it literally anywhere except to go get ice cream on Sunday’s. I want to keep the Coy wheels...how do I do a disc brake conversion without changing the bolt pattern

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