Del sol what engine

Alright everybody. I have a 93 del sol sohc. I want to swap engines in it to make it faster. I was wondering what is the best bang for the buck. And what will be the easiest to get in there. I recently swapped engines in my 91 integra and I didn't have to get any new wiring or anything. What will be the fastest and the easiest to put in the del sol. I appreciate anybody.

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http://www.automotiveforums.com/vbulletin/showthread.php?t=19176
But that should help.