Slant six flywheel for manual trans

So I pulled the engine and transmission from my 63 Dart and have an engine from a 64 that I’ll be using. I don’t know what year the motor is. I’m assuming it’s a 60s era motor. I measured the flange on the back of the crank 1.9625. I drove the 64 before I pulled it apart. Motor is real Pepe but I’m sure nowhere near 400 hp. I want to put a four speed in, but I don’t think that I can use my three speed bill housing, correct me if I’m wrong. I’d like to buy one of the older A-833 transmissions, but I guess they’re kind of rare. From what I’ve been reading the A-833 OD trans has basically same ratios as a 3 speed with overdrive 4th gear, and they don’t shift as quick as the non overdrive trans. Don’t think I need a clutch that beefy but I’m sure I could be wrong. This car will be a rat, driver, as low buck as I can get it but no junk under the hood………car.

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You can blow up a parts store clutch with stock HP level. If you end up buying a flywheel and new clutch you’ll be a few hundred even with the stock replacements.