Hoses should be hardish but you should be able to squeeze them a bit.
I have an old MK2 jag and the cooling can be a bit marginal in modern traffic, it does have a kenlow but it does run just the hot side of the temperature gauge. I added "water wetter" and it now runs on the cool side of the middle of the gauge.
I do intend at some point to swap over to Evans waterless coolant, bit pricey but it's big advantage is that it doesn't expand with heat so there is no pressure on the cooling system which has to be goo in the long run.
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