Headman makes a nice set in their Husler line. They are only 1 3/4" but still enough to make a touch over 600rwhp on our Dynojet with a 388" Pump gas SBC with a tuned 150 shot of spray. One tube goes around the frame on each side.
there,s a pic of my buddies 23deg sbc with 1 7/8 heddman headers , wish my vega and Bu headers where like these plugs changes are a breeze every plug is 4 times easier to get at then the set-ups i have . i,ll see if i have some more images i,ll post them for you