Pickup/Van/Dakota (same part for all three vehicles) – the Magnum exhaust manifolds exit where the firewall currently resides at. I would think the headers pictured above would have the same problem.
Now Jeep Grand Cherokee Magnum exhaust manifolds exit more to what the FMJ small block manifolds exit at – so I would “think” they would be more likely to fit your car more than the pickup version does.
Left Pickup/Van/Dakota (’92-03) Magnum:
View attachment 32109
Left (‘93-98) Grand Cherokee Magnum:
View attachment 32110
Left FMJ manifold (typical):
View attachment 32111
If going with pre ’73 or with Magnum cylinder heads – you don’t have much to worry about with either headers or Magnum exhaust manifolds. The post ’74 up to Magnum cylinder heads have A.I.R. ports that will need to be taken into consideration – otherwise.
View attachment 32112
BudW