I am fitting a Jaguar V6 engine into our MGB and hopefully will be sorting out a wiring loom after Xmas, since you have no need for the existing O2 sensors your new wideband sensor can be fitted in the existing position before the catalytic convertor. A common solution to the MAP sensor is this one; https://www.ebay.co.uk/itm/391781615269
The calibration data is available on the internet, Speeding Parts based in Sweden list the calibration date on their website, they are reasonably priced and ship quickly  
These are used by many aftermarket ECU manufacturers and only need a 4mm pipe to the manifold. Although I am not brave enough many people have drilled and tapped a manifold by keeping the drill bit and tap heavily coated with grease to catch the swarf. Coincidently my heavily modified Ford manifold is off to be TIG welded today

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