'70 Chrysler 300 8 3/4???

742 case is nice because you can swap things around in there, 741 will work but not what you call gold. 489 and 742 are highly sought after. Be aware of the clutch and cone style, clutch can be rebuilt, so no one is ever willing to sell them, when they do they sell so fast that no one even sees them. You always take a gamble buying a cone case because you dont know if the seller is getting rid of it due to it is starting to fail. if you buy one and it doesnt work, it goes to the dump and your more than likely out 300