63-66 A-body header alternatives

I have the Hooker 5208 Super comps on my 64. As in the previous posts, you do not have to cut the opening as big as they say. I did not cut the upper flat part at all!!!
Spitfire is an alternative, but good luck getting them. Laysons(www.laysons.com) advertises these????? But they are for non power steering cars.

Bob