A advise

cudamark said
If he's using the stock 273 exhaust manifolds, even 1 7/8" exhaust would be big enough....might even improve low end torque and exhaust scavaging.

For a 2bbl. Hwy mileage master….. maybe…..
Doubt IT! and would lay out a 4 digit bet of cash I’ll out torque you by 20% on that single 1-7/8.