5.7 L hemi into a 72 Dodge Demon

Map63vette, You would be surprised about the frame rail. They are not that thick and a 90 amp mig will do a good job. If the feed on it is not smooth it is most likely just the liner in the gun. Depending on what welder you have the liner may just be replaceable. If it is permanent then blow it out with some air and run some wd40 through it. You would be surprised at how much that will help.
GD thanks for the pics. I may copy the frame massage instead of trying to track down some Jeep manifolds.