Think: Sunbeam Tiger. Maybe wedge in a small V-8?

 

How about the F20C in a lotus?

http://www.prototyperacing.com/f20kit.htm

 

even id you could make a C32 fit, You biggest problem is going to be how to make the engine rotate the opposite direction. The F20c and the New K-series engines all rotate clockwise. All other Honda's rotate CCW. So If you had a big enough shoehorn, You would need Reverse ground camshafts, a reverse wound starter armature, It's either that, Or complete custom rear differential, and transmission. In other words, Stick with what you have.