I have a '63 VW pan. My 2276 doesn't seem to overwhelm the chassis. I will follow up in six more months however
Again, no heater for me. Web 86b, 105 LSA, 42/37.5 valves on 040 heads. My deck height is not 'optimal' but I had 45cc heads to work with. I have no issues with low end response, overheating and driveabiliry
I do think a smaller motor would be more in the spirit of what these cars were designed to run with the available technology back in the day.