Use the 1-7/8" headers or even 2" headers.
I used the Hooker 2" headers on my 451 "B" engine with a 251 @ 0.050" solid street roller cam, B-1 B/S heads, 11:1 compression, M1 single plane and 1,000 cfm Holley HP and it ran great. With a 10" 3,500 stall converter and 3.91:1 gears traction was a problem