Sounds like fun. Looking forward to seeing pictures as you continue.
I don't think you would need to weld up that manifold for 1bar pressure as long as that rubber cap is in good shape. But it's probably 40 year old rubber and it would be a pain if it blew out on the road, so welding it is a good idea for reliability.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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