Any chance you can repair it? They usually go at the seam and I'm sure there's a product out there that can seal that up, even if you have to coat the entire header tank!
A friend of mine split one along the seam, opened it up, filled the seam with gipe of some sort and riveted the sucker back together.
Gotta be creative/get a parts car/rich to run a 25+ yr old car as a daily, eh?
94 XJ40 VDP
Oyster Metallic/Doeskin on Aero Alloys
230,000 Kilometers 143,000 MilesDaily Driver
94 XJ40 SOVEREIGN
Diamond Blue Metallic/Barley
111,000 Kilometers/69,000 MilesParts Car