How much hp/torq will an OEM 833 4sp and 8 3/4 take?

thanks... the m-car became the 4th barracuda in my collection and it kind of took over all priority on my cars. along with two 340 cars, i have a nice original 69 Formula S fastback with a 383 and a 4 speed and a 3:91. it is a plain gold car with the stripe delete. i'm going to put A-57 stripes and hood scoops on that car to try and "jazz up" the paint and appearance. i haven't driven it for years. i don't know why, it just has been sitting in my garage. there's some pics of it here on FABO on my garage under JimHarvard.
You need to get that 69 out & drive it my friend. Doesn't do them any good sitting & when you do you will think "ive should've done this long ago"