I don't know what you are used to Morgan but that is going to feel fkn quick as a street car to you,
Jensen did not have any special blocks or heads made or played with over here, everything was stock as a rock as it came from Chrysler, Only thing that was a bit special is the fact they bought the Chrysler inventory of complete 440 sixpack engines with matching transmissions circa 350 of the beauty,s,
And another that I would love to find and own but no chance as the guy is a hoarder and knows its worth, is a machine called a FFF 100 its a Jensen FF chassis with a fibre glass body on it not disimilar to a bloated lotus esprit the kicker is it had a full tilt keith Black Hemi in it 600 hp Tflite with FF transfer unit
and blew the 0-100-0 record in to the weeds was built by gkn engineering with help to show of there wares tremendous machine I want it
So I would assume you have a stock 440 block from an old Jensen but so what they are all great blocks
Jensen did in fact build 320 FF Ferguson Formula 4x4cars in mk1 mk2 and mk3 variants not only were they 4 wheel drive they also had a crude but effective Dunlop maxeret anti lock braking system on them, for the time a very pioneering mtr car they still feel great to drive now, I have one no 88 from the production line,,
And just one more

In the early 90,s Jensen were still going sort of after going bust in the mid/late 70,s they always soldierd through-just under a guy now called Hugh wainwright because b/rb block mopar engines were now gone the new cars were being fitted with 360 engines and fuel injection not really enough guts to propell a 4,000lb car like a New Jensen owner would expect, so he had his guys build a 440 and have stageiv Hemi cylinder heads fitted to his personnal car using it as a test bed along with a 4 speed auto hoping it would all work out well and was the future for the Interceptor, not to be the firm went bust again, and all assets sold off i believe that Pete Jordan and Martin saville bought that engine and it now resides in that awesome 69 super bee,
Sorry for off topic but i am a mega fan off Jensen cars to,,

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