Hi Karl,
I'm sure you'll get some private notes on this one...I'm not really in favour of doing these sorts of conversions, but it is your car and you can do what you like. I'd suggest the V6 Chev (they make a 60 degree V that fits the engine bay of a Jaguar MK2, so should fit the 122). I have a 1960 Jag MK2 and once considered the V6 conversion, but got flamed so hard on my Jag list just for asking the same question you did that I saw the error of my ways.
The downsides of these conversions are that they devalue the car and change the flavour of the beast. While the engine may fit, it isn't always that straight forward to construct mounts, rework heating arrangements and get gages working correctly (you could always stick on a bunch of aftermarket gages and a huge 5" tach for that rice-ride look :-) ). I think having a retro ride is much cooler than trying to build some sort of FrankenVolvo. Search for a b20 to rebuild and put a V-Performance supercharger on it (no connection)...your son will have more than enough power to get into lots of trouble with the local constabulary and should have lots of fun breaking rear axels etc.
I'm simply uprating the performance of my 122s as the B18 is getting tired and with the new front suspension, I need more performance to keep the stupid grin on my face full-time.
Cheers,
Craig
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