IMO the easiest way, involving the least work/incompatibility problems would be to keep all the ancillaries from the 1a and just use the bare 1b engine.
If you try to mix and max components you"ll have problems, many parts aren't interchangeable, distributor, injectors, ecu, engine wiring harness have differences. (not an exhaustive list, I may have forgotten things)
If you need the part number for the 1a intake, PM me the 1a VIN # and I'll look it up in the EPC.
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