Finally!

Congrats. And understand health thing. Similar situation got me back into cars. Took that to get me to say - screw it, I'm getting what I always wanted.

If you want it with nice manners, I like what AJ said. Blown or turbo the 360.

If you want something N/A then definitely stroke the 400! Even with cam around .500 you should be at 1hp/CI.

Congrats again. Can't wait for pics!