Horsepower limit for out of the box Edelbrock RPM heads

If you’re asking if it will work with 3.23 gears, lugging the engine around town, I’d say no, but if you’re talking about sustained highway cruising with an OD, it’ll work fine. Just downshift before trying to pass! Running a small block at low rpm seems counterintuitive to me. Isn’t that what the big blocks are for? In a road course car, wouldn’t you gear it accordingly?
Weight on the front end is a bad, bad thing in road racing, rally, auto-x. I'd far prefer a small block with AL heads and intake to drop 100 lbs off the engine and front end weight. Weight is always a big enemy in cornering, and, besides, you can easily get RWD torque to exceed the available traction while cornering (which is lower than straight line traction) with a small block these days, in all gears except maybe the top one. So the big block is a poor choice unless you are on a wide open course with long straights.