Joe,
   I like to consider myself a decent mechanic.  They have alot of kits out there to really beef up the Oliver engines, including the 77.  Subscribe to the national antique tractor pulling magazine "The Hook"  Here you'll find many different machine shops just dying to give your 77 just the power it deserves.  Hell, perhaps if you wanted, you and I could ride up to one of these places, I have a 77 frame which is minus the PTO, minus the lift bars and a few other weight adding items.  I have been wanting to make this into a puller for a long time (perhaps a stroker crank and power cam, along with turbo and alcohol).  Looking forward to your insite and ideas.  Lets get together for lunch or dinner one day.

Ed