Meh, similar size and HP to the original with a few more rpm.I have the Pontiac engine in there for now and it almost fills the space with about 50mm to spare. I do have Renault straight eight engine parts but not enough to make up a complete engine. But I know a guy..
Many of the city cars in the 1930s had wire wheels but this one came with what I suppose are colonial wheels 450 dia. I prefer these to wire wheels anyway.
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Those Pontiac engines are pretty durable, and ex US, parts aren't too hard to find.
Pontiac made a couple of "Specials" in 1954 using the 268 CID engine that had four downdraught Carter carbs and made 230 BHP.
There was a straiģht 8 engine on EBay a number of years ago where they had modified the original manifold to accept four Holden Strombergs. Looked pretty cool.
Originality is nice, but so is driving something.
I could have spent years chasing an original engine and gearbox for my 1924 Douglas.
Or chuck a similar HP engine out of something else in it and start using it straiģht away. I chose the latter.
I'm guessing like me, you adapted the engine to the frame, not the frame to the engine, so can go straight back to original at any time.
Wire wheels are good to look at, but as PITA to own.