22R Motor Heard I can go with a 20R head?

I have a 1989 Toyota pickup and its in need of a head. Ive heard people say that you can use a 20R Head on a 22R motor and get more horsepower.... Iam not going with a 20R head for power its because I already have one..If i can use it will i have to do modifacations

Has anyone tried this before ....Any help will be greatly appricated.

Maybe the answer is here
http://www.automotiveforums.com/vbulletin/showpost.php?p=4989915&postcount=8

A little late, but NO, a 20R head will only bolt-up to an 84 or older 22R/RE block.