Slow build 71 Scamp 440

How far are you from Washington state?
You need a bolt in sprag, that failure is what causes the front drum to explode.
That cam seems awfully small but it might make your goal, definitely will make a lot of torque for sure.
Are you going to race the car or just want it to sound cool when going out on the town?
For heads, if you're not thinking drag racing just buy some damn 440 source stealth heads. They're cheap but are less than what you'd pay to have factory heads built to same spec & you'll lose 40 pounds off the nose of the car.
I'm in Ontario Canada. I do frequent Victoria BC quiet a bit. No racing, just looking for a mean street machine not to say I wouldn't take the opportunity to run down the strip once or twice. Definitely need that nice sounding cam. Do you have recommendation on the cam? Those heads are very affordable. wow. Id be very happy at 550hp in a Scamp!