Big Block Truck Headers/Exhaust manifolds wanted

On my 78 D-150 440 powered truck I installed a set of the B-body 383/440 magnum manifolds... These are said to not fit, I found only 3 mods and they fit fine... Left side only needed a slight mod to the kick down linkage and a little massaging of the firewall... Right side I had to heat and bend up 90*a small section of the frame... You do see many truck frames that come from the factory with small sections of the frame bent like this... The stock truck manifolds flow like crap with only a 2" outlet and are prone to cracking...