I remember when I was a kid, we lived in an area which was an oval close and this old guy who lived on the opposite side had a hotrod similar to this. From what I know, that hotrod V8 big block he had in it must have had straight exit exhaust pipes with no muffler as everytime he brought it out of the garage, the thundering rumble sound of that V8 bounced off all the houses around the close. Even the front windows in our house used to rattle when that thing was idling.
From watching numerous youtube vids, it must have been a 454 or 502 big block as only those big blocks produced that really raw throaty fierce sound. 302 or 350 engines sounded a bit more tame.