[Pearsonistic]

I just bought a Pearson 30 (1976) with a broken atomic four. I am planning on replacing the motor with a rebuilt atomic four from Moyer Marine. I'd like advise.
I was considering mounting a motor mount on the transom for an outboard to get me underway until the motor can be replaced. Then I'll buy a used outboard which I can keep as a backup. Is this a dumb I idea? Should I just wait for the new engine? Is it a bad plan to drill holes in the transom for a motor mount I might not use much?

Diesel: reliable, stinky, noisy, efficient, $11K or more installed, good for long cruises, good resale value, (do I need a new prop if I switch to diesel?)
Gasoline: quiet, familiar, $6K installed, not planning on motoring much anyhow (but who knows, it's my first boat).
Any thoughts?