engine mods?

I'm no cat guy, but what are you looking to do? Ice drags? Circle Track racing or what? I would agree I would try to pick up a 440 z motor, maybe even trade for the whole sled or sell, buy a 440 z. I've seen a couple on auto trader, not cheap but would be fun to have. They are museam worthy lol. If u wanna keep the el tigre, maybe bore, stroke it to a 440. Custom dual pipes, maybe bigger carbs. Set it up to run on higher octane fuel, probably wouldn't handle race fuel though. If it's oil injected, i'd make it a pre- mix, ditch the oiling system to loose a few pounds by removing oil tank, pump etc if possible. I'm sure they are steel skis, maybe find an aluminum set or make a set of aluminum short drag skis. Play with the primary weights, change a helix in the secondary maybe. Gear it maybe but you'll loose in either direction of acceleration or top speed. If you're gonna run drags, gear it so it has a good acceleration, don't worry about a top speed. Find other ways to lighten it up. Lighter seat, hood( all though i doubt no one makes a lighter one for your sled) but you can get rid of headlight assemblies etc. And as everyone says (not trying to be a dick) but being light and aerodynamic ur self is key. But all in all have fun with it. Classic sleds are so much fun.