Depends on what you mean "more room" but in the cabin there is a little more elbow room. I suspect that there's more headroom too, especially with the double bubble roof. In terms of luggage capacity the Stratos wins hands down. The 037 has none.
If you're serious about an 037 replica then I can highly recommend Mick Covill who makes kits here in the UK. You do need to find a donor Monte Carlo Spider (Or Scorpion) though and it involves a lot of surgery. And it won't be cheap either by the time you've sourced a twin cam, supercharger and the right (ZF?) gearbox.
Here's an eBay listing for the subframes for an 037 to fit to a chassis.
https://www.ebay.co.uk/itm/Lancia-03...AAAOSwjvJZUAzL
Good luck with it!
Guy
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