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You might, and I mean might, be able to find later heads for the same block which make a substantial difference. example 2.0/2.2 Douvrin engine (Renault version). You could have 106/108hp (SPFI), 120/123hp (MPFI), 140hp 12v 2.0, 136hp 12v 2.2vi and you might, if you're feeling rich be able to cobble a turbo version out of the 108hp head, some spacers and a supercinq turbo on a custom manifold, which if the 2.2 Chrysler motor was any guide might give you around 150-160ish. If you really like to spend money there was a 16v head for this engine but it's rarer than hens teeth by now..
There's others, the Ford Ka engine is basically a "modern" head bolted onto a Kent block from a 105E/123E Anglia (think flying Rowling-mobile that really dislikes willow trees). Ford are fairly famous for it. Rootes did it with the Audax, 53hp to 107hp in different tunes and displacements, but basically the same engine.
there are also kits available to convert carb cars to SPFI/MPFI, some even with obd2 computers, they're not cheap but they're about. As a guide you'd be looking at 15/20% hp increase, and going from 80hp to 96hp isn't too bad, which is what the 1725cc Humber Sceptre engine would manage.
The problem; would you ever recoupe the money and would you have annoying officials causing you hassle..
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