Headers for a big block a body?

hi, i used shumacker on my 440 conversion,they were reasonable price considering shipping and import tax my end<my goverment suck>made the engine swap much easier,used their mounts too, am very happy with the quality,did toy around with cast jensen interceptor<british car,440 motor>but they cracked on installing engine, couldnt do anything but remove the motor,discard the cast manifolds<or throw them.....>as i did, get on phone to supplier, 6 weeks and away! they not the y or tri but go down to single tube just passed steering box so was just a case of fabricating pipe to flange plate supplied and away.you gotta bite the bullet as i did and am now with 1.0 torsion bars/front end rebuild, good luck!