a903 , a230, a833 , a833od

If it's a Slant, it should be a so-called 9.5" flywheel, so called because that's what clutch it takes. It's got 122 teeth on the starter ring gear. I'll be putting an A833OD in place of the factory 3-speed in my '68 Valiant. That requires a different bellhousing, but the flywheel/clutch/pressure plate/throwout bearing/pilot bearing (bushing) are the same parts.

The A833OD uses a specific bellhousing with a 5.125" pilot opening. The first year for that bell is 1975 and it's overdrive-specific. '75-'76 A-bodies used it, as did '76-'80 F-bodies & pickup trucks. The '81-up truck bell can also be used but it requires a similar-year clutch fork. The throwout bearing still didn't change, though.

If you look up the clutch for the car, unless some serious shenanigans have happened--which would be obvious--you'll get the right parts. Don't over-think this.