741 8-3/4 application?

I believe I have the answer to my question already, but for peace of mind...will a 741 be just fine for an a-body with a 340 running 400-450 hp, auto trans? Again street use mainly, some track time here and there. And will it be borderline or plenty overkill for such an application?

I have an opportunity maybe to buy one with the gears I want, 3:55, with sure grip too. Which by the way...what's a fair price for one these days? Researching internet prices are all over the place. I don't know which type of sure grip yet, clutch or cone, so ballpark for both would good to know.