~450hp from stock stroke 340?

Personally if I didn’t know what I know and had a set of TrickFlow heads I would make a phone call to Jim at Racer Brown. I would tell him the size of engine, advertised compression, tell him I have a set of TrickFlow heads and advertised flow numbers, intake and carb I was going to use, header size, preference on type of cam but I would be open minded, and a target horsepower (425-450, 450-475) and he’ll want to know that in this case it’s a street car.