<!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: --> I will answer your second question first, no a 3-71 will not fit in your 77 stock frame. Much alteration to the frame would need to be done to install that large of a motor.  First question would be yes, look at some tractor junk yards and you could piece together a motor.  Maibach, and O'Brien Imp. would be good.  Larry Harsin would be another good place to check with.  Korves OLiver has gotten in quite a few different blocks for olivers.  This may spark some interest in restoring the 77, I hope so.   Steve